| Anthidiellum (Loyolanthidium) notatum Latreille, 1809 | Cancellate semele |
| Anthidiellum (Loyolanthidium) perplexum Smith, 1854 | |
| Anthidium (Anthidium) atripes Cresson, 1879 | |
| Anthidium (Anthidium) banningense Cockerell, 1904 | |
| Anthidium (Anthidium) clypeodentatum Swenk, 1914 | |
| Anthidium (Anthidium) cockerelli Schwarz, 1928 | |
| Anthidium (Anthidium) collectum Huard, 1896 | |
| Anthidium (Anthidium) dammersi Cockerell, 1937 | |
| Anthidium (Anthidium) edwardsii Cresson, 1878 | Edwards´ Wool-carder Bee |
| Anthidium (Anthidium) emarginatum Say, 1824 | |
| Anthidium (Anthidium) jocosum Cresson, 1878 | |
| Anthidium (Anthidium) maculifrons Smith, 1854 | Spot-fronted Wool-carder Bee |
| Anthidium (Anthidium) maculosum Cresson, 1878 | |
| Anthidium (Anthidium) mormonum Cresson, 1878 | |
| Anthidium (Anthidium) palliventre Cresson, 1878 | |
| Anthidium (Anthidium) palmarum Cockerell, 1904 | |
| Anthidium (Anthidium) paroselae Cockerell, 1898 | |
| Anthidium (Anthidium) placitum Cresson, 1879 | |
| Anthidium (Anthidium) porterae Cockerell, 1900 | Porter´s Wool-carder Bee |
| Anthidium (Anthidium) psoraleae Robertson, 1902 | |
| Anthidium (Anthidium) sonorense Cockerell, 1923 | |
| Anthidium (Anthidium) tenuiflorae Cockerell, 1907 | |
| Anthidium (Anthidium) utahense Swenk, 1914 | Utah Wool-carder Bee |
| Anthidium (Callanthidium) formosum Cresson, 1878 | |
| Anthidium (Callanthidium) illustre Cresson, 1879 | |
| Anthidium ehrhorni Cockerell, 1900 | |
| Anthidium emarginata Say, 1824 | |
| Anthidium manicata Linnaeus, 1758 | |
| Anthidium montivagum (Cresson, 1878) | ⇒ Anthidium emarginatum Say, 1824 |
| Anthidium notatum (Latreille, 1809) | ⇒ Anthidiellum notatum Latreille, 1809 |
| Anthidium pallidiclypeum Jaycox, 1963 | |
| Anthidium perplexum (Smith, 1854) | ⇒ Anthidiellum perplexum Smith, 1854 |
| Anthidium rodecki Schwarz, 1934 | |
| Ashmeadiella (Arogochila) australis Cockerell, 1902 | |
| Ashmeadiella (Arogochila) barberi Michener, 1939 | |
| Ashmeadiella (Arogochila) breviceps Michener, 1939 | |
| Ashmeadiella (Arogochila) cazieri Michener, 1939 | |
| Ashmeadiella (Arogochila) erema Michener, 1939 | |
| Ashmeadiella (Arogochila) eurynorhyncha Michener, 1939 | |
| Ashmeadiella (Arogochila) foxiella Michener, 1939 | |
| Ashmeadiella (Arogochila) inyoensis Michener, 1939 | |
| Ashmeadiella (Arogochila) micheneri Snelling, 1962 | |
| Ashmeadiella (Arogochila) salviae Michener, 1939 | |
| Ashmeadiella (Arogochila) timberlakei Michener, 1936 | |
| Ashmeadiella (Ashmeadiella) altadenae Michener, 1936 | |
| Ashmeadiella (Ashmeadiella) aridula Cockerell, 1910 | |
| Ashmeadiella (Ashmeadiella) bigeloviae Cockerell, 1897 | |
| Ashmeadiella (Ashmeadiella) bucconis Say, 1837 | |
| Ashmeadiella (Ashmeadiella) cactorum (Cockerell, 1897) | ⇒ Ashmeadiella aridula Cockerell, 1910 |
| Ashmeadiella (Ashmeadiella) californica Ashmead, 1897 | |
| Ashmeadiella (Ashmeadiella) cubiceps Cresson, 1879 | |
| Ashmeadiella (Ashmeadiella) difugita Michener, 1939 | |
| Ashmeadiella (Ashmeadiella) dimalla Michener, 1939 | |
| Ashmeadiella (Ashmeadiella) femorata Michener, 1936 | |
| Ashmeadiella (Ashmeadiella) foveata Michener, 1939 | |
| Ashmeadiella (Ashmeadiella) gillettei Titus, 1904 | |
| Ashmeadiella (Ashmeadiella) leucozona Cockerell, 1924 | |
| Ashmeadiella (Ashmeadiella) maxima Michener, 1936 | |
| Ashmeadiella (Ashmeadiella) occipitalis Michener, 1939 | |
| Ashmeadiella (Ashmeadiella) opuntiae Cockerell, 1897 | |
| Ashmeadiella (Ashmeadiella) pronitens Cockerell, 1906 | |
| Ashmeadiella (Ashmeadiella) prosopidis Cockerell, 1897 | |
| Ashmeadiella (Ashmeadiella) rufipes Titus, 1904 | |
| Ashmeadiella (Ashmeadiella) sonora Michener, 1939 | |
| Ashmeadiella (Ashmeadiella) stevensi Michener, 1937 | |
| Ashmeadiella (Chilosmia) rhodognatha Cockerell, 1924 | |
| Ashmeadiella (Cubitognatha) xenomastax Michener, 1939 | |
| Ashmeadiella biscopula Michener, 1939 | |
| Ashmeadiella chumashae Griswold, 1985 | |
| Ashmeadiella clypeodentata Michener, 1936 | |
| Ashmeadiella cockerelli Michener, 1936 | |
| Ashmeadiella floridanus Robertson, 1897 | |
| Ashmeadiella holtii Cockerell, 1898 | |
| Ashmeadiella lateralis Michener, 1936 | |
| Ashmeadiella leachi Michener, 1949 | |
| Ashmeadiella lutzi Cockerell, 1930 | |
| Ashmeadiella meliloti Cockerell, 1897 | |
| Ashmeadiella neomexicanum Cockerell, 1904 | |
| Ashmeadiella rufitarsis Michener, 1939 | |
| Ashmeadiella sculleni Michener, 1939 | |
| Ashmeadiella stenognatha Michener, 1939 | |
| Ashmeadiella titusi Michener, 1939 | |
| Ashmeadiella truncativentris Michener, 1951 | |
| Ashmeadiella vandykiella Michener, 1949 | |
| Chelostoma (Foveosmia) californicum Cresson, 1878 | |
| Chelostoma (Foveosmia) minutum Crawford, 1916 | |
| Chelostoma (Foveosmia) phaceliae Michener, 1938 | |
| Chelostoma (Prochelostoma) philadelphi Robertson, 1891 | Mock-Orange Scissor Bee |
| Chelostoma bernardinum Michener, 1938 | |
| Chelostoma cockerelli Michener, 1938 | |
| Chelostoma incisulum Michener, 1938 | |
| Chelostoma marginatum Michener, 1938 | Long-legged cave amphipod |
| Chelostoma minuta (Crawford, 1916) | ⇒ Chelostoma minutum Crawford, 1916 |
| Chelostoma tetramerum Michener, 1942 | |
| Coelioxys (Acrocoelioxys) dolichos Fox, 1890 | Carpenter-mimic Cuckoo-leaf-cutter |
| Coelioxys (Boreocoelioxys) banksi Crawford, 1914 | |
| Coelioxys (Boreocoelioxys) funeraria Smith, 1854 | |
| Coelioxys (Boreocoelioxys) insita Cresson, 1872 | |
| Coelioxys (Boreocoelioxys) moesta Cresson, 1864 | |
| Coelioxys (Boreocoelioxys) octodentata Say, 1824 | Eight-toothed Cuckoo-leaf-cutter |
| Coelioxys (Boreocoelioxys) porterae Cockerell, 1900 | Porter'S Cuckoo Leaf-Cutter Bee |
| Coelioxys (Boreocoelioxys) pratti Crawford, 1914 | |
| Coelioxys (Boreocoelioxys) salinaria Cockerell, 1925 | |
| Coelioxys (Boreocoelioxys) sayi Robertson, 1897 | Say'S Cuckoo Leaf-Cutter Bee |
| Coelioxys (Coelioxys) hirsutissima Cockerell, 1912 | |
| Coelioxys (Coelioxys) immaculata Cockerell, 1912 | |
| Coelioxys (Coelioxys) sodalis Cresson, 1878 | Comrade Cuckoo Leafcutter Bee |
| Coelioxys (Cyrtocoelioxys) angelica Cockerell, 1905 | |
| Coelioxys (Cyrtocoelioxys) deani Cockerell, 1909 | |
| Coelioxys (Cyrtocoelioxys) gilensis Cockerell, 1896 | |
| Coelioxys (Cyrtocoelioxys) gonaspis Cockerell, 1924 | |
| Coelioxys (Cyrtocoelioxys) hunteri Crawford, 1914 | Hunter´s Cuckoo-leaf-cutter |
| Coelioxys (Cyrtocoelioxys) modesta Smith, 1854 | Modest Cuckoo-leaf-cutter |
| Coelioxys (Cyrtocoelioxys) obtusiventris Crawford, 1914 | |
| Coelioxys (Cyrtocoelioxys) scitula Cresson, 1872 | |
| Coelioxys (Glyptocoelioxys) germana Cresson, 1878 | |
| Coelioxys (Haplocoelioxys) mexicana Cresson, 1878 | Mexican Cuckoo-leaf-cutter |
| Coelioxys (Neocoelioxys) menthae Cockerell, 1897 | |
| Coelioxys (Neocoelioxys) slossoni Viereck, 1902 | |
| Coelioxys (Synocoelioxys) alternata Say, 1837 | Alternate Cuckoo-leaf-cutter |
| Coelioxys (Synocoelioxys) apacheorum Cockerell, 1900 | |
| Coelioxys (Synocoelioxys) texana Cresson, 1872 | |
| Coelioxys (Xerocoelioxys) aperta Cresson, 1878 | |
| Coelioxys (Xerocoelioxys) edita Cresson, 1872 | |
| Coelioxys (Xerocoelioxys) grindeliae Cockerell, 1900 | |
| Coelioxys (Xerocoelioxys) piercei Crawford, 1914 | |
| Coelioxys asclepiadis Cockerell, 1925 | |
| Coelioxys bisoncornua Hill, 1936 | |
| Coelioxys boharti Mitchell, 1962 | |
| Coelioxys erysimi Cockerell, 1912 | |
| Coelioxys floridana Cresson, 1878 | |
| Coelioxys galactiae Mitchell, 1962 | |
| Coelioxys mesae Cockerell, 1921 | |
| Coelioxys mitchelli Baker, 1975 | |
| Coelioxys nodis Baker, 1975 | |
| Coelioxys novomexicana Cockerell, 1909 | |
| Coelioxys rufitarsus Smith, 1854 | Red-footed sharptail |
| Coelioxys serricauda Baker, 1975 | |
| Coelioxys soledadensis Cockerell, 1909 | |
| Dianthidium (Adanthidium) arizonicum Rohwer, 1916 | |
| Dianthidium (Adanthidium) texanum Cresson, 1878 | |
| Dianthidium (Dianthidium) concinnum Cresson, 1872 | |
| Dianthidium (Dianthidium) cressonii Dalla Torre, 1896 | |
| Dianthidium (Dianthidium) curvatum Smith, 1854 | |
| Dianthidium (Dianthidium) heterulkei Schwarz, 1940 | |
| Dianthidium (Dianthidium) parvum Cresson, 1878 | |
| Dianthidium (Dianthidium) pudicum Cresson, 1879 | |
| Dianthidium (Dianthidium) simile Cresson, 1864 | Northeastern Pebble Bee |
| Dianthidium (Dianthidium) subparvum Swenk, 1914 | |
| Dianthidium (Dianthidium) ulkei Cresson, 1878 | |
| Dianthidium desertorum Timberlake, 1943 | |
| Dianthidium discors Timberlake, 1948 | |
| Dianthidium dubium Schwarz, 1928 | |
| Dianthidium floridiense Schwarz, 1926 | |
| Dianthidium implicatum Timberlake, 1948 | |
| Dianthidium marshi Grigarick & ..., 1964 | |
| Dianthidium parkeri Grigarick & ..., 1964 | |
| Dianthidium platyurum Cockerell, 1923 | |
| Dianthidium plenum Timberlake, 1943 | |
| Dianthidium singulare Cresson, 1879 | |
| Dianthidium subrufulum Timberlake, 1943 | |
| Dioxys aurifuscus Titus, 1901 | |
| Dioxys pacificus Cockerell, 1916 | |
| Dioxys pomonae Cockerell, 1910 | |
| Dioxys productus Cresson, 1879 | |
| Dioxys rohweri Cockerell, 1908 | |
| Dolichostelis costalis (Cresson, 1872) | ⇒ Stelis costalis Cresson, 1872 |
| Dolichostelis laticincta (Cresson, 1878) | ⇒ Stelis laticincta Cresson, 1878 |
| Dolichostelis louisae (Cockerell, 1911) | ⇒ Stelis costalis Cresson, 1872 |
| Dolichostelis perpulchra (Crawford, 1916) | ⇒ Stelis perpulchra Crawford, 1916 |
| Dolichostelis rudbeckiarum (Cockerell, 1904) | ⇒ Stelis rudbeckiarum Cockerell, 1904 |
| Heriades (Neotrypetes) gracilior Cockerell, 1897 | |
| Heriades (Neotrypetes) leavitti Crawford, 1913 | Leavitt'S Armored-Resin Bee |
| Heriades (Neotrypetes) occidentalis Michener, 1938 | |
| Heriades (Neotrypetes) timberlakei Michener, 1938 | |
| Heriades carinatum Cresson, 1864 | |
| Heriades cressoni Michener, 1938 | |
| Heriades crucifera Cockerell, 1897 | |
| Heriades micheneri Timberlake, 1947 | |
| Heriades micropthalma Michener, 1954 | Long-legged cave amphipod |
| Heriades texana Michener, 1938 | |
| Heriades variolosa Cresson, 1872 | |
| Hoplitis (Acrosmia) laevibullata Michener, 1943 | |
| Hoplitis (Alcidamea) brachyodonta Cockerell, 1933 | |
| Hoplitis (Alcidamea) colei Crawford, 1916 | |
| Hoplitis (Alcidamea) elongaticeps Michener, 1947 | |
| Hoplitis (Alcidamea) grinnelli Cockerell, 1910 | |
| Hoplitis (Alcidamea) pilosifrons Cresson, 1864 | Hairy-Fronted Small-Mason |
| Hoplitis (Alcidamea) producta Cresson, 1864 | Produced Small-Mason |
| Hoplitis (Alcidamea) truncata Cresson, 1878 | Truncate Small-Mason |
| Hoplitis (Alcidamea) uvulalis Cockerell, 1902 | |
| Hoplitis (Cyrtosmia) hypocrita Cockerell, 1906 | |
| Hoplitis (Dasyosmia) biscutellae Cockerell, 1897 | |
| Hoplitis (Formicapis) robusta Nylander, 1848 | |
| Hoplitis (Hoplitina) bullifacies Michener, 1947 | |
| Hoplitis (Hoplitina) howardi Cockerell, 1910 | |
| Hoplitis (Hoplitis) anthocopoides Schenck, 1853 | Mason Bee |
| Hoplitis (Monumetha) albifrons Kirby, 1837 | White-Fronted Small-Mason |
| Hoplitis (Monumetha) fulgida Cresson, 1864 | |
| Hoplitis (Monumetha) louisae Cockerell, 1934 | |
| Hoplitis (Monumetha) viridimicans Cockerell, 1897 | |
| Hoplitis (Penteriades) incanescens Cockerell, 1922 | |
| Hoplitis (Penteriades) remotula Cockerell, 1910 | |
| Hoplitis (Proteriades) bidenticauda Timberlake &..., 1950 | |
| Hoplitis (Proteriades) bunocephala Michener, 1947 | |
| Hoplitis (Proteriades) caudex Timberlake &..., 1950 | |
| Hoplitis (Proteriades) deserticola Timberlake &..., 1950 | |
| Hoplitis (Proteriades) hamulicornis Timberlake &..., 1950 | |
| Hoplitis (Proteriades) nanula Timberlake &..., 1950 | |
| Hoplitis (Proteriades) palmarum Cockerell, 1935 | |
| Hoplitis (Proteriades) reducta Timberlake &..., 1950 | |
| Hoplitis (Proteriades) seminigra Timberlake &..., 1950 | |
| Hoplitis (Proteriades) semirubra Cockerell, 1898 | |
| Hoplitis (Proteriades) tristis Michener, 1936 | |
| Hoplitis (Proteriades) xerophila Cockerell, 1935 | |
| Hoplitis (Robertsonella) micheneri Mitchell, 1962 | |
| Hoplitis (Robertsonella) simplex Cresson, 1864 | |
| Hoplitis abjecta Cresson, 1878 | |
| Hoplitis alboscopatum Provancher, 1888 | |
| Hoplitis anthodyta Michener, 1943 | |
| Hoplitis arizonensis Michener, 1954 | |
| Hoplitis basingeri Timberlake &..., 1950 | |
| Hoplitis beameri Michener, 1951 | |
| Hoplitis boharti Timberlake &..., 1950 | |
| Hoplitis copelandica Cockerell, 1908 | |
| Hoplitis cryptanthae Timberlake &..., 1950 | |
| Hoplitis cylindricus Cresson, 1864 | |
| Hoplitis daleae Michener, 1951 | |
| Hoplitis elongata Michener, 1936 | |
| Hoplitis emarginatus Griswold, 1983 | |
| Hoplitis enceliae Cockerell, 1935 | |
| Hoplitis evansi Michener, 1936 | |
| Hoplitis gleasoni Titus, 1904 | |
| Hoplitis hebitis Michener, 1954 | |
| Hoplitis hemizoniae Cockerell, 1935 | |
| Hoplitis hurdiana Michener, 1954 | |
| Hoplitis hypostomalis Michener, 1949 | |
| Hoplitis imperfecta Provancher, 1896 | |
| Hoplitis jacintanum Cockerell, 1910 | |
| Hoplitis linsdalei Michener, 1947 | |
| Hoplitis maryae Michener, 1949 | |
| Hoplitis mirifica Michener, 1954 | |
| Hoplitis mojavensis Michener, 1947 | |
| Hoplitis namatophila Michener, 1954 | |
| Hoplitis nigrella Michener, 1954 | |
| Hoplitis nitidivitta Michener, 1943 | |
| Hoplitis oregona Michener, 1943 | |
| Hoplitis orthognathus Griswold, 1983 | |
| Hoplitis paiute Griswold, 1983 | |
| Hoplitis panamintensis Michener, 1943 | |
| Hoplitis paroselae Michener, 1947 | |
| Hoplitis phaceliarum Cockerell, 1935 | |
| Hoplitis plagiostoma Michener, 1947 | |
| Hoplitis pycnognatha Michener, 1943 | |
| Hoplitis pygmaea Timberlake &..., 1950 | |
| Hoplitis robustula Cockerell, 1935 | |
| Hoplitis rubrella Michener, 1949 | |
| Hoplitis rupestris Cockerell, 1935 | |
| Hoplitis sambuci Titus, 1904 | |
| Hoplitis segregata Michener, 1954 | |
| Hoplitis shoshone Parker, 1976 | |
| Hoplitis similis Friese, 1909 | |
| Hoplitis timberlakei Cockerell, 1935 | |
| Hoplitis torchioi Parker, 1979 | |
| Hoplitis triodonta Cockerell, 1935 | |
| Hoplitis truicauda Timberlake &..., 1950 | |
| Hoplitis viguierae Cockerell, 1935 | |
| Lithurge apicalis Cresson, 1875 | |
| Lithurge echinocacti Cockerell, 1898 | |
| Lithurge gibbosus Smith, 1853 | |
| Lithurge listrota Snelling, 1983 | |
| Lithurge littoralis Cockerell, 1917 | |
| Megachile (Acentron) albitarsis Cresson, 1872 | White-footed Leaf-cutter Bee |
| Megachile (Argyropile) parallela Smith, 1853 | Parallel Leaf-cutter Bee |
| Megachile (Argyropile) rossi Mitchell, 1943 | |
| Megachile (Argyropile) sabinensis Mitchell, 1934 | |
| Megachile (Argyropile) townsendiana Cockerell, 1898 | |
| Megachile (Chelostomoides) adelphodonta Cockerell, 1924 | |
| Megachile (Chelostomoides) angelarum Cockerell, 1902 | |
| Megachile (Chelostomoides) browni Mitchell, 1934 | |
| Megachile (Chelostomoides) campanulae Robertson, 1903 | Bellflower resin bee |
| Megachile (Chelostomoides) chilopsidis Cockerell, 1900 | Desert-willow Resin Bee |
| Megachile (Chelostomoides) davidsoni Cockerell, 1902 | Golden-eardrops Resin Bee |
| Megachile (Chelostomoides) discorhina Cockerell, 1924 | |
| Megachile (Chelostomoides) exilis Cresson, 1872 | Slender Resin Bee |
| Megachile (Chelostomoides) georgica Cresson, 1878 | |
| Megachile (Chelostomoides) lobatifrons Cockerell, 1924 | |
| Megachile (Chelostomoides) manni Mitchell, 1934 | |
| Megachile (Chelostomoides) occidentalis Fox, 1894 | |
| Megachile (Chelostomoides) odontostoma Cockerell, 1924 | |
| Megachile (Chelostomoides) rugifrons Smith, 1854 | Rugose-Fronted Resin Bee |
| Megachile (Chelostomoides) spinotulata Mitchell, 1934 | |
| Megachile (Chelostomoides) subexilis Cockerell, 1908 | |
| Megachile (Chelostomoides) texensis Mitchell, 1956 | |
| Megachile (Cressoniella) zapoteca Cresson, 1878 | |
| Megachile (Eutricharaea) apicalis (Spinola, 1808) | ⇒ Megachile analis Nylander, 1852 |
| Megachile (Eutricharaea) concinna Smith, 1853 | Elegant leaf-cutter bee |
| Megachile (Leptorachis) petulans Cresson, 1878 | Petulant Leaf-cutter Bee |
| Megachile (Litomegachile) brevis (Say, 1837) | ⇒ Megachile pseudobrevis Mitchell, 1934 |
| Megachile (Litomegachile) coquilletti Cockerell, 1915 | |
| Megachile (Litomegachile) gentilis Cresson, 1872 | Leafcutter bee |
| Megachile (Litomegachile) lippiae Cockerell, 1900 | |
| Megachile (Litomegachile) mendica Cresson, 1878 | Flat-tailed Leaf-cutter Bee |
| Megachile (Litomegachile) onobrychidis Cockerell, 1908 | Western Little Leaf-cutter Bee |
| Megachile (Litomegachile) pseudobrevis Mitchell, 1934 | Southeastern Little Leaf-cutter Bee |
| Megachile (Litomegachile) texana Cresson, 1878 | Texas Leaf-cutter Bee |
| Megachile (Megachile) centuncularis Linnaeus, 1758 | Common leaf-cutter bee |
| Megachile (Megachile) inermis Provancher, 1888 | Freckled milkvetch |
| Megachile (Megachile) lapponica Thomson, 1872 | Alfilaree |
| Megachile (Megachile) montivaga Cresson, 1878 | Silver-tailed Petal-cutter Bee |
| Megachile (Megachile) nivalis (Friese, 1903) | ⇒ Megachile lapponica Thomson, 1872 |
| Megachile (Megachile) relativa Cresson, 1878 | Golden-Tailed Leafcutter |
| Megachile (Megachiloides) alamosana (Mitchell, 1934) | ⇒ Megachile anograe Cockerell, 1908 |
| Megachile (Megachiloides) alata Mitchell, 1934 | |
| Megachile (Megachiloides) amica Cresson, 1872 | |
| Megachile (Megachiloides) anograe Cockerell, 1908 | |
| Megachile (Megachiloides) brimleyi Mitchell, 1926 | |
| Megachile (Megachiloides) casadae Cockerell, 1898 | |
| Megachile (Megachiloides) coloradensis (Mitchell, 1936) | ⇒ Megachile zapoteca Cresson, 1878 |
| Megachile (Megachiloides) dakotensis Mitchell, 1926 | |
| Megachile (Megachiloides) deflexa Cresson, 1878 | |
| Megachile (Megachiloides) fucata Mitchell, 1934 | |
| Megachile (Megachiloides) gravita Mitchell, 1934 | |
| Megachile (Megachiloides) hookeri Cockerell, 1915 | |
| Megachile (Megachiloides) integra Cresson, 1878 | |
| Megachile (Megachiloides) integrella Mitchell, 1926 | |
| Megachile (Megachiloides) legalis Cresson, 1879 | |
| Megachile (Megachiloides) manifesta Cresson, 1878 | |
| Megachile (Megachiloides) mucorosa Cockerell, 1908 | |
| Megachile (Megachiloides) nevadensis Cresson, 1879 | |
| Megachile (Megachiloides) oenotherae Mitchell, 1924 | |
| Megachile (Megachiloides) pascoensis Mitchell, 1934 | |
| Megachile (Megachiloides) rubi Mitchell, 1924 | |
| Megachile (Megachiloides) soledadensis Cockerell, 1900 | |
| Megachile (Megachiloides) subnigra Cresson, 1879 | |
| Megachile (Megachiloides) wheeleri Mitchell, 1927 | |
| Megachile (Megachiloides) wyomingensis Mitchell, 1934 | |
| Megachile (Megachiloides) xerophila Cockerell, 1933 | |
| Megachile (Melanosarus) bahamensis Mitchell, 1927 | Bahama Leaf-cutter Bee |
| Megachile (Melanosarus) xylocopoides Smith, 1853 | Carpenter-mimic Leaf-cutter Bee |
| Megachile (Neochelynia) chichimeca Cresson, 1878 | |
| Megachile (Neoeutrichaea) rotundata Fabricius, 1793 | Alfalfa leaf-cutter bee |
| Megachile (Pseudocentron) pruina Smith, 1853 | Hoary Leaf-cutter Bee |
| Megachile (Pseudocentron) sidalceae Cockerell, 1897 | |
| Megachile (Pseudomegachile) lanata Fabricius, 1775 | Wooly Wall Bee |
| Megachile (Sayapis) fidelis Cresson, 1878 | Faithful leafcutting bee |
| Megachile (Sayapis) frugalis Cresson, 1872 | |
| Megachile (Sayapis) helianthi (Cockerell, 1908) | ⇒ Megachile montivaga Cresson, 1878 |
| Megachile (Sayapis) inimica Cresson, 1872 | Hostile Leaf-cutter Bee |
| Megachile (Sayapis) newberryae Cockerell, 1900 | Newberry´s leaf-cutter Bee |
| Megachile (Sayapis) policaris Say, 1831 | |
| Megachile (Xanthosarus) addenda Cresson, 1878 | Cranberry Leafcutter |
| Megachile (Xanthosarus) agustini Cockerell, 1905 | |
| Megachile (Xanthosarus) analis Nylander, 1852 | |
| Megachile (Xanthosarus) circumcincta Kirby, 1802 | Black-headed leaf-cutter bee |
| Megachile (Xanthosarus) cochisiana Mitchell, 1934 | |
| Megachile (Xanthosarus) comata Cresson, 1872 | |
| Megachile (Xanthosarus) dentitarsus Sladen, 1919 | |
| Megachile (Xanthosarus) fortis Cresson, 1872 | |
| Megachile (Xanthosarus) frigida Smith, 1853 | Frigid Leaf-cutter Bee |
| Megachile (Xanthosarus) gemula Cresson, 1878 | Small-handed Leaf-cutter Bee |
| Megachile (Xanthosarus) giliae (Cockerell, 1906) | ⇒ Megachile circumcincta Kirby, 1802 |
| Megachile (Xanthosarus) ingenua Cresson, 1878 | |
| Megachile (Xanthosarus) innupta Cockerell, 1915 | |
| Megachile (Xanthosarus) latimanus Say, 1823 | Broad-handed Leaf-cutter Bee |
| Megachile (Xanthosarus) melanophaea Smith, 1853 | Black-and-gray Leaf-cutter Bee |
| Megachile (Xanthosarus) mucida Cresson, 1878 | |
| Megachile aegra (Mitchell, 1930) | ⇒ Megachile brethesi Schrottky, 1909 |
| Megachile asterae Mitchell, 1943 | |
| Megachile astragali Mitchell, 1938 | |
| Megachile bidentata Fabricius, 1775 | |
| Megachile boharti Mitchell, 1942 | |
| Megachile bradleyi Mitchell, 1934 | |
| Megachile brethesi Schrottky, 1909 | |
| Megachile bruneri Mitchell, 1934 | |
| Megachile cylindrica Friese, 1906 | |
| Megachile dentipes (Vachal, 1909) | ⇒ Megachile cylindrica Friese, 1906 |
| Megachile dulciana Mitchell, 1934 | |
| Megachile hilata Mitchell, 1934 | |
| Megachile impartita Mitchell, 1934 | |
| Megachile instita Mitchell, 1934 | |
| Megachile inyoensis Mitchell, 1942 | |
| Megachile laguniana Mitchell, 1937 | |
| Megachile latita Mitchell, 1934 | |
| Megachile laurita Mitchell, 1927 | |
| Megachile macneilli Mitchell, 1957 | |
| Megachile maurata Mitchell, 1936 | |
| Megachile melanderi Mitchell, 1944 | |
| Megachile mellitarsis Cresson, 1878 | |
| Megachile micheneri Mitchell, 1936 | |
| Megachile mojavensis Mitchell, 1934 | |
| Megachile morio (Smith, 1853) | ⇒ Megachile pruina Smith, 1853 |
| Megachile nelsoni Mitchell, 1936 | |
| Megachile oslari Mitchell, 1934 | |
| Megachile pagosiana Mitchell, 1934 | |
| Megachile palmensis Mitchell, 1934 | |
| Megachile parksi Mitchell, 1936 | |
| Megachile perhirta Cockerell, 1898 | |
| Megachile pseudolegalis Mitchell, 1957 | |
| Megachile pseudonigra Mitchell, 1927 | |
| Megachile pugnatus Say, 1837 | |
| Megachile seducta Mitchell, 1934 | |
| Megachile semilaurita Mitchell, 1927 | |
| Megachile stoddardensis Mitchell, 1957 | |
| Megachile subanograe Mitchell, 1934 | |
| Megachile sublaurita Mitchell, 1927 | |
| Megachile subparallela Mitchell, 1944 | |
| Megachile subspinotulata Mitchell, 1934 | |
| Megachile toscata Mitchell, 1934 | |
| Megachile tulariana Mitchell, 1937 | |
| Megachile umatillensis Mitchell, 1927 | |
| Megachile victoriana Mitchell, 1934 | |
| Megachile yumensis Mitchell, 1944 | |
| Osmia (Acanthosmioides) calcarata White, 1952 | Lily of the valley vine |
| Osmia (Acanthosmioides) dakotensis Michener, 1937 | |
| Osmia (Acanthosmioides) francisconis (White, 1952) | ⇒ Osmia enixa Sandhouse, 1924 |
| Osmia (Acanthosmioides) giffardi Sandhouse, 1939 | |
| Osmia (Acanthosmioides) giliarum Cockerell, 1906 | |
| Osmia (Acanthosmioides) hurdi (White, 1952) | ⇒ Osmia austromaritima Michener, 1936 |
| Osmia (Acanthosmioides) integra Cresson, 1878 | |
| Osmia (Acanthosmioides) kenoyeri (Cockerell, 1915) | ⇒ Osmia tarsata Provancher, 1888 |
| Osmia (Acanthosmioides) lanei Sandhouse, 1939 | |
| Osmia (Acanthosmioides) longula Cresson, 1864 | |
| Osmia (Acanthosmioides) nifoata Cockerell, 1909 | |
| Osmia (Acanthosmioides) nigrifrons Cresson, 1878 | |
| Osmia (Acanthosmioides) nigrobarbata Cockerell, 1916 | |
| Osmia (Acanthosmioides) obliqua White, 1952 | Lily of the valley vine |
| Osmia (Acanthosmioides) odontogaster Cockerell, 1897 | |
| Osmia (Acanthosmioides) physariae (Cockerell, 1907) | ⇒ Osmia giliarum Cockerell, 1906 |
| Osmia (Acanthosmioides) prunorum Cockerell, 1897 | |
| Osmia (Acanthosmioides) sedula Sandhouse, 1924 | |
| Osmia (Acanthosmioides) sladeni (Sandhouse, 1925) | ⇒ Osmia nifoata Cockerell, 1909 |
| Osmia (Acanthosmioides) trifoliama Sandhouse, 1939 | |
| Osmia (Acanthosmioides) unca Michener, 1937 | |
| Osmia (Acanthosmioides) watsoni Cockerell, 1911 | |
| Osmia (Cephalosmia) californica Cresson, 1864 | |
| Osmia (Cephalosmia) grinnelli Cockerell, 1910 | |
| Osmia (Cephalosmia) marginipennis Cresson, 1878 | |
| Osmia (Cephalosmia) montana Cresson, 1864 | |
| Osmia (Cephalosmia) subaustralis Cockerell, 1900 | |
| Osmia (Chenosmia) cobaltina Cresson, 1878 | |
| Osmia (Diceratosmia) botitena Cockerell, 1909 | |
| Osmia (Diceratosmia) conjuncta Cresson, 1864 | |
| Osmia (Diceratosmia) subfasciata Cresson, 1872 | |
| Osmia (Helicosmia) chalybea Smith, 1853 | Stout tagelus |
| Osmia (Helicosmia) coerulescens Linnaeus, 1758 | |
| Osmia (Helicosmia) coloradensis Cresson, 1878 | Colorado Osmia |
| Osmia (Helicosmia) georgica Cresson, 1878 | Georgia Mason |
| Osmia (Melanosmia) albiventris Cresson, 1864 | |
| Osmia (Melanosmia) albolateralis Cockerell, 1906 | |
| Osmia (Melanosmia) alpestris Rust & Bohart, 1986 | |
| Osmia (Melanosmia) atriventris Cresson, 1864 | Maine blueberry bee |
| Osmia (Melanosmia) atrocyanea Cockerell, 1897 | |
| Osmia (Melanosmia) bakeri (Sandhouse, 1924) | ⇒ Osmia melanopleura Cockerell, 1916 |
| Osmia (Melanosmia) brevis Cresson, 1864 | |
| Osmia (Melanosmia) bruneri Cockerell, 1897 | |
| Osmia (Melanosmia) bucephala Cresson, 1864 | Bufflehead Mason Bee |
| Osmia (Melanosmia) calla Cockerell, 1897 | |
| Osmia (Melanosmia) cara Cockerell, 1910 | |
| Osmia (Melanosmia) caulicola Cockerell, 1934 | |
| Osmia (Melanosmia) cerasi Cockerell, 1897 | |
| Osmia (Melanosmia) clarescens Cockerell, 1911 | |
| Osmia (Melanosmia) cockerelli (Sandhouse, 1939) | ⇒ Osmia dakotensis Michener, 1937 |
| Osmia (Melanosmia) collinsiae Robertson, 1905 | Collinsia Mason |
| Osmia (Melanosmia) cordata Robertson, 1902 | |
| Osmia (Melanosmia) crassa Rust & Bohart, 1986 | |
| Osmia (Melanosmia) cyanella Cockerell, 1897 | |
| Osmia (Melanosmia) cyaneonitens Cockerell, 1906 | |
| Osmia (Melanosmia) densa Cresson, 1864 | |
| Osmia (Melanosmia) distincta Cresson, 1864 | Distinct Mason Bee |
| Osmia (Melanosmia) enixa Sandhouse, 1924 | |
| Osmia (Melanosmia) exigua Cresson, 1878 | |
| Osmia (Melanosmia) felti Cockerell, 1911 | |
| Osmia (Melanosmia) gabrielis Cockerell, 1910 | |
| Osmia (Melanosmia) gaudiosa Cockerell, 1907 | |
| Osmia (Melanosmia) grindeliae Cockerell, 1910 | |
| Osmia (Melanosmia) hemera Sandhouse, 1939 | |
| Osmia (Melanosmia) hendersoni Cockerell, 1907 | |
| Osmia (Melanosmia) hesperos Sandhouse, 1939 | |
| Osmia (Melanosmia) indeprensa Sandhouse, 1939 | |
| Osmia (Melanosmia) inermis Zetterstedt, 1838 | Mountain mason bee |
| Osmia (Melanosmia) inspergens Lovell & Coc..., 1907 | Shiny-Faced Mason Bee |
| Osmia (Melanosmia) inurbana Cresson, 1878 | |
| Osmia (Melanosmia) iridis Cockerell & ..., 1902 | |
| Osmia (Melanosmia) juxta Cresson, 1864 | |
| Osmia (Melanosmia) kincaidii Cockerell, 1897 | |
| Osmia (Melanosmia) lacus Sandhouse, 1939 | |
| Osmia (Melanosmia) laeta Sandhouse, 1924 | |
| Osmia (Melanosmia) liogastra Cockerell, 1933 | |
| Osmia (Melanosmia) malina Cockerell, 1909 | |
| Osmia (Melanosmia) marginata Michener, 1936 | |
| Osmia (Melanosmia) melanopleura Cockerell, 1916 | |
| Osmia (Melanosmia) mertensiae Cockerell, 1907 | |
| Osmia (Melanosmia) nanula Cockerell, 1897 | |
| Osmia (Melanosmia) neocyanopoda Rust & Bohart, 1986 | |
| Osmia (Melanosmia) nigriventris Zetterstedt, 1838 | |
| Osmia (Melanosmia) pagosa Sandhouse, 1939 | |
| Osmia (Melanosmia) paradisica Sandhouse, 1924 | |
| Osmia (Melanosmia) pikei Cockerell, 1907 | |
| Osmia (Melanosmia) proxima Cresson, 1864 | |
| Osmia (Melanosmia) pulsatillae Cockerell, 1907 | |
| Osmia (Melanosmia) pumila Cresson, 1864 | Dwarf Mason Bee |
| Osmia (Melanosmia) raritatis Michener, 1957 | |
| Osmia (Melanosmia) rawlinsi Sandhouse, 1939 | |
| Osmia (Melanosmia) regulina Cockerell, 1911 | |
| Osmia (Melanosmia) rostrata Sandhouse, 1924 | |
| Osmia (Melanosmia) sanctaerosae Cockerell, 1910 | |
| Osmia (Melanosmia) sandhouseae Mitchell, 1927 | |
| Osmia (Melanosmia) sculleni Sandhouse, 1939 | |
| Osmia (Melanosmia) simillima Smith, 1853 | Similar Mason Bee |
| Osmia (Melanosmia) solitaria Sandhouse, 1924 | |
| Osmia (Melanosmia) tersula Cockerell, 1912 | Wide-Banded Mason Bee |
| Osmia (Melanosmia) texana Cresson, 1872 | Texas Mason Bee |
| Osmia (Melanosmia) titusi (Cockerell, 1905) | ⇒ Osmia phenax Cockerell, 1897 |
| Osmia (Melanosmia) tristella Cockerell, 1897 | |
| Osmia (Melanosmia) virga Sandhouse, 1939 | Twig Mason Bee |
| Osmia (Melanosmia) zephyros Sandhouse, 1939 | |
| Osmia (Monilosmia) bridwelli (Sandhouse, 1939) | ⇒ Osmia cara Cockerell, 1910 |
| Osmia (Mystacosmia) nemoris Sandhouse, 1924 | |
| Osmia (Nothosmia) latisulcata Michener, 1936 | |
| Osmia (Osmia) cornifrons Radoszkowski, 1887 | Horn-faced bee |
| Osmia (Osmia) lignaria Say, 1837 | Blue orchard bee |
| Osmia (Osmia) ribifloris Cockerell, 1900 | Blueberry bee |
| Osmia (Pyrosmia) pusilla Cresson, 1864 | |
| Osmia angustipes Cockerell, 1933 | |
| Osmia ashmeadii Titus, 1904 | Long-horn caddisflies |
| Osmia austromaritima Michener, 1936 | |
| Osmia cahuilla Cooper, 1993 | |
| Osmia claremontensis (Michener, 1936) | ⇒ Osmia sedula Sandhouse, 1924 |
| Osmia cyanopoda Cockerell, 1916 | |
| Osmia dolerosa Sandhouse, 1939 | |
| Osmia foxi Cameron, 1901 | |
| Osmia glaucum Fowler, 1899 | |
| Osmia illinoensis Robertson, 1897 | |
| Osmia lupinicola Cockerell, 1937 | |
| Osmia michiganensis Mitchell, 1962 | |
| Osmia mixta Michener, 1936 | |
| Osmia morongana Cockerell, 1937 | |
| Osmia nigritula (Friese, 1902) | ⇒ Osmia atriventris Cresson, 1864 |
| Osmia novaescotiae Cockerell, 1912 | |
| Osmia pellax (Sandhouse, 1924) | ⇒ Osmia nifoata Cockerell, 1909 |
| Osmia pentstemonis Cockerell, 1906 | |
| Osmia phenax Cockerell, 1897 | |
| Osmia pingreeana Michener, 1937 | |
| Osmia potentillae Michener, 1936 | |
| Osmia sequoiae Michener, 1936 | |
| Osmia tanneri Sandhouse, 1939 | |
| Osmia tarsata Provancher, 1888 | Freckled milkvetch |
| Osmia thysanisca Michener, 1957 | |
| Osmia tokopahensis Michener, 1936 | |
| Osmia trevoris Cockerell, 1897 | |
| Osmia vandykei Sandhouse, 1924 | |
| Paranthidium jugatoria Say, 1824 | |
| Paranthidium sonorum Michener, 1942 | |
| Protosmia (Chelostomopsis) rubifloris Cockerell, 1898 | |
| Protostelis anthidioides Timberlake, 1941 | |
| Protostelis australis Cresson, 1878 | |
| Protostelis grossa Mitchell, 1962 | |
| Protostelis hurdi Thorp, 1966 | |
| Protostelis manni Crawford, 1917 | |
| Protostelis texana Thorp, 1966 | |
| Stelis (Dolichostelis) costalis Cresson, 1872 | |
| Stelis (Dolichostelis) laticincta Cresson, 1878 | |
| Stelis (Dolichostelis) louisae Cockerell, 1911 | |
| Stelis (Dolichostelis) perpulchra Crawford, 1916 | |
| Stelis (Dolichostelis) rudbeckiarum Cockerell, 1904 | |
| Stelis (Microstelis) sexmaculata Ashmead, 1896 | |
| Stelis (Stelis) anthracina Timberlake, 1941 | |
| Stelis (Stelis) callura Cockerell, 1925 | |
| Stelis (Stelis) carnifex Cockerell, 1911 | |
| Stelis (Stelis) coarctatus Crawford, 1916 | Constrained Cuckoo Carder Bee |
| Stelis (Stelis) diversicolor Crawford, 1916 | |
| Stelis (Stelis) interrupta Cresson, 1897 | |
| Stelis (Stelis) labiata Provancher, 1888 | Kissing Cuckoo Carder Bee |
| Stelis (Stelis) lateralis Cresson, 1864 | Spot-Sided Dark Bee |
| Stelis (Stelis) montana Cresson, 1864 | |
| Stelis (Stelis) monticola Cresson, 1878 | |
| Stelis (Stelis) permaculata Cockerell, 1898 | Sixteen-Spotted Cuckoo Carder Bee |
| Stelis (Stelis) subcaerulea Cresson, 1878 | |
| Stelis (Stelis) subemarginata Cresson, 1878 | |
| Stelis acutiventris Linsley, 1939 | |
| Stelis ashmeadiellae Timberlake, 1941 | |
| Stelis ater Mitchell, 1962 | |
| Stelis calliphorina Cockerell, 1911 | |
| Stelis chlorocyanea Cockerell, 1925 | |
| Stelis cockerelli Hicks, 1933 | |
| Stelis crassiceps Cockerell, 1926 | |
| Stelis cusackae Cockerell, 1910 | |
| Stelis depressa Timberlake, 1941 | |
| Stelis elegans Cresson, 1864 | |
| Stelis foederalis Smith, 1854 | Federal Cuckoo Carder Bee |
| Stelis fragariella Cockerell, 1925 | |
| Stelis franciscana Cockerell, 1925 | |
| Stelis fremonti Cockerell, 1925 | |
| Stelis hemirhoda Linsley, 1939 | |
| Stelis holocyanea Cockerell, 1925 | |
| Stelis idahoensis Swenk, 1914 | |
| Stelis leucotricha Cockerell, 1925 | |
| Stelis linsleyi Timberlake, 1941 | |
| Stelis maculatum Provancher, 1888 | |
| Stelis melanotricha Cockerell, 1925 | |
| Stelis micheneri Linsley, 1939 | |
| Stelis michiganensis Mitchell, 1962 | |
| Stelis nigrita Fabricius, 1775 | |
| Stelis nigriventris Timberlake, 1941 | |
| Stelis nitida Cresson, 1878 | |
| Stelis nitidula Cockerell, 1925 | |
| Stelis nyssonoides Brues, 1903 | |
| Stelis palmarum Timberlake, 1941 | |
| Stelis pavonina Cockerell, 1908 | |
| Stelis plenum Provancher, 1888 | |
| Stelis pulchra Crawford, 1902 | |
| Stelis ricardonis Cockerell, 1912 | |
| Stelis robertsoni Timberlake, 1941 | |
| Stelis rubi Cockerell, 1898 | |
| Stelis semirubra Timberlake, 1941 | |
| Stelis seneciophila Cockerell, 1908 | |
| Stelis subglauca Cockerell, 1925 | |
| Stelis trichopyga Timberlake, 1941 | |
| Stelis trypetinum (Robertson, 1902) | ⇒ Stelis permaculata Cockerell, 1898 |
| Stelis vernalis Mitchell, 1962 | |
| Trachusa (Heteranthidium) bequaerti Schwarz, 1926 | |
| Trachusa (Heteranthidium) cordaticeps Michener, 1949 | |
| Trachusa (Heteranthidium) gummifera Thorp, 1963 | |
| Trachusa (Heteranthidium) larreae Cockerell, 1897 | |
| Trachusa (Heteranthidium) timberlakei Schwarz, 1928 | |
| Trachusa (Legnanthidium) ridingsii Cresson, 1878 | |
| Trachusa (Trachusomimus) perdita Cockerell, 1904 | California leafcutting bee |
| Trachusa (Ulanthidium) manni Crawford, 1917 | |
| Trachusa autumnale Snelling, 1966 | |
| Trachusa crassipes Cresson, 1878 | |
| Trachusa dorsale Lepeletier, 1841 | |
| Trachusa fontemvitae Schwarz, 1926 | |
| Trachusa interdisciplinaris Peters, 1972 | |
| Trachusa occidentale Cresson, 1868 | |
| Trachusa zebratum Cresson, 1872 | |
| Xeroheriades micheneri Griswold, 1986 | Mammoth Cave amphipod |
