| Anthidiellum (Loyolanthidium) notatum Latreille, 1809 | Cancellate semele |
| Anthidiellum notatum robertsoni (Cockerell, 1904) | ⇒ Anthidiellum notatum Latreille, 1809 |
| Anthidiellum robertsoni Cockerell, 1904 | |
| Anthidium (Anthidium) clypeodentatum Swenk, 1914 | |
| Anthidium (Anthidium) edwardsii Cresson, 1878 | Edwards´ Wool-carder Bee |
| Anthidium (Anthidium) florentinum Fabricius, 1775 | Wool carder bee |
| Anthidium (Anthidium) maculifrons Smith, 1854 | Spot-fronted Wool-carder Bee |
| Anthidium (Anthidium) manicatum Linnaeus, 1758 | Continental Wool-carder Bee |
| Anthidium (Anthidium) mormonum Cresson, 1878 | |
| Anthidium (Anthidium) psoraleae Robertson, 1902 | |
| Anthidium (Anthidium) tenuiflorae Cockerell, 1907 | |
| Anthidium (Anthidium) utahense Swenk, 1914 | Utah Wool-carder Bee |
| Anthidium (Callanthidium) formosum Cresson, 1878 | |
| Anthidium (Proanthidium) oblongatum Illiger, 1806 | Oblong wool carder bee |
| Anthidium exhumatum ♰ Cockerell, 1906 | |
| Anthidium scudderi ♰ Cockerell, 1906 | |
| Ashmeadiella (Arogochila) australis Cockerell, 1902 | |
| Ashmeadiella (Arogochila) cazieri Michener, 1939 | |
| Ashmeadiella (Ashmeadiella) bucconis Say, 1837 | |
| Ashmeadiella curriei | |
| Chelostoma (Foveosmia) campanularum Kirby, 1802 | Carpenter bee |
| Chelostoma (Gyrodromella) rapunculi Lepeletier, 1841 | Rampion Scissor Bee |
| Chelostoma (Prochelostoma) philadelphi Robertson, 1891 | Mock-Orange Scissor Bee |
| Coelioxys (Acrocoelioxys) producta Cresson, 1865 | |
| Coelioxys (Boreocoelioxys) funeraria Smith, 1854 | |
| 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) rufitarsis Smith, 1854 | Red-Footed Cuckoo Leaf-Cutter Bee |
| Coelioxys (Boreocoelioxys) sayi Robertson, 1897 | Say'S Cuckoo Leaf-Cutter Bee |
| Coelioxys (Coelioxys) immaculata Cockerell, 1912 | |
| Coelioxys (Coelioxys) sodalis Cresson, 1878 | Comrade Cuckoo Leafcutter Bee |
| Coelioxys (Cyrtocoelioxys) modesta Smith, 1854 | Modest Cuckoo-leaf-cutter |
| Coelioxys (Synocoelioxys) alternata Say, 1837 | Alternate Cuckoo-leaf-cutter |
| Coelioxys (Xerocoelioxys) grindeliae Cockerell, 1900 | |
| Coelioxys atlantica (Mitchell, 1962) | ⇒ Coelioxys octodentata Say, 1824 |
| Coelioxys rufitarsus Smith, 1854 | Red-footed sharptail |
| Coelioxys vufitorsis | |
| Dianthidium (Dianthidium) curvatum Smith, 1854 | |
| Dianthidium curvatum sayi Cockerell, 1907 | |
| Dianthidium (Dianthidium) pudicum Cresson, 1879 | |
| Dianthidium (Dianthidium) simile Cresson, 1864 | Northeastern Pebble Bee |
| Dianthidium (Dianthidium) subparvum Swenk, 1914 | |
| Dianthidium plenum Timberlake, 1943 | |
| Dianthidium singulare Cresson, 1879 | |
| Heriades (Neotrypetes) carinatus Cresson, 1864 | |
| Heriades (Neotrypetes) leavitti Crawford, 1913 | Leavitt'S Armored-Resin Bee |
| Heriades (Neotrypetes) variolosus (Cresson, 1872) | ⇒ Heriades variolosa Cresson, 1872 |
| Heriades carinata Cresson, 1864 | Carinate Armored-Resin Bee |
| Heriades gibbosa Friese, 1909 | |
| Heriades variolosa Cresson, 1872 | |
| Heriades variolosa variolosa Cresson, 1872 | |
| Hoplitis fulgida platyura | |
| 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 (Cyrtosmia) hypocrita Cockerell, 1906 | |
| Hoplitis (Formicapis) robusta Nylander, 1848 | |
| Hoplitis (Hoplitis) anthocopoides Schenck, 1853 | Mason Bee |
| Hoplitis (Monumetha) albifrons Kirby, 1837 | White-Fronted Small-Mason |
| Hoplitis (Monumetha) fulgida Cresson, 1864 | |
| Hoplitis (Monumetha) spoliata Provancher, 1888 | Dilated-Horned Small-Mason |
| Hoplitis (Robertsonella) simplex Cresson, 1864 | |
| Hoplitis brachypogon brachypogon Perez, 1879 | |
| Hoplitis cylindrica Cresson, 1864 | |
| Lithurgus gibbosus Smith, 1853 | |
| Megachile (Argyropile) parallela Smith, 1853 | Parallel Leaf-cutter Bee |
| Megachile (Callomegachile) rufiventris Guérin-Ménev..., 1834 | |
| Megachile (Callomegachile) sculpturalis Smith, 1853 | Giant resin bee |
| Megachile (Chalicodoma) manicata Giraud, 1861 | |
| Megachile (Chelostomoides) angelarum Cockerell, 1902 | |
| Megachile (Chelostomoides) campanulae Robertson, 1903 | Bellflower resin bee |
| Megachile campanulae campanulae | |
| Megachile (Chelostomoides) prosopidis (Cockerell, 1900) | ⇒ Megachile occidentalis Fox, 1894 |
| Megachile (Eutricharaea) apicalis (Spinola, 1808) | ⇒ Megachile analis Nylander, 1852 |
| Megachile (Eutricharaea) apostolica Cockerell, 1937 | |
| Megachile (Eutricharaea) rotundata Fabricius, 1787 | Alfafa leafcutting bee |
| Megachile (Eutricharaea) semiflava (Cockerell, 1937) | ⇒ Megachile cordata Smith, 1879 |
| Megachile (Gronoceras) cincta Fabricius, 1781 | |
| 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) anograe Cockerell, 1908 | |
| Megachile (Megachiloides) casadae Cockerell, 1898 | |
| Megachile (Megachiloides) manifesta Cresson, 1878 | |
| Megachile (Megachiloides) nevadensis Cresson, 1879 | |
| Megachile (Megachiloides) subnigra Cresson, 1879 | |
| Megachile (Megachiloides) wheeleri Mitchell, 1927 | |
| Megachile (Neoeutrichaea) rotundata Fabricius, 1793 | Alfalfa leaf-cutter bee |
| Megachile (Pseudomegachile) ericetorum Lepeletier, 1841 | Banded Mud Bee |
| Megachile (Sayapis) fidelis Cresson, 1878 | Faithful leafcutting bee |
| Megachile (Sayapis) policaris Say, 1831 | |
| Megachile (Sayapis) pugnata Say, 1837 | Pugnacious Leaf-cutter Bee |
| Megachile pugnata pugnata Say, 1837 | |
| Megachile (Xanthosarus) addenda Cresson, 1878 | Cranberry Leafcutter |
| Megachile (Xanthosarus) analis Nylander, 1852 | |
| Megachile (Xanthosarus) circumcincta Kirby, 1802 | Black-headed leaf-cutter bee |
| 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) latimanus Say, 1823 | Broad-handed Leaf-cutter Bee |
| Megachile (Xanthosarus) melanophaea Smith, 1853 | Black-and-gray Leaf-cutter Bee |
| Megachile melanophaea submelanophaea Mitchell, 1935 | |
| Megachile (Xanthosarus) perihirta Cockerell, 1898 | Furry Leaf-cutter Bee |
| Megachile campanula | |
| Megachile chelostomoides Gribodo, 1894 | |
| Megachile cleomis (Cockerell, 1900) | ⇒ Megachile texana Cresson, 1878 |
| Megachile dentitarsis | |
| Megachile frigide | |
| Megachile karooensis Brauns, 1912 | |
| Megachile maxillosa Guérin-Ménev..., 1845 | |
| Megachile melanophoea | |
| Megachile mellitarsis Cresson, 1878 | |
| Megachile perniciosa (Friese, 1903) | ⇒ Megachile rufiventris Guérin-Ménev..., 1834 |
| Megachile rhyssalus Wu, 2005 | |
| Megachile sublaurita Mitchell, 1927 | |
| Megachile umatillensis Mitchell, 1927 | |
| Monumetha obsoleta Cresson, 1864 | |
| Osmia (Acanthosmioides) giliarum Cockerell, 1906 | |
| Osmia (Acanthosmioides) integra Cresson, 1878 | |
| Osmia (Acanthosmioides) kenoyeri (Cockerell, 1915) | ⇒ Osmia tarsata Provancher, 1888 |
| Osmia (Acanthosmioides) longula Cresson, 1864 | |
| Osmia (Acanthosmioides) nifoata Cockerell, 1909 | |
| Osmia (Acanthosmioides) nigrifrons Cresson, 1878 | |
| Osmia (Acanthosmioides) nigrobarbata Cockerell, 1916 | |
| Osmia (Acanthosmioides) odontogaster Cockerell, 1897 | |
| Osmia (Acanthosmioides) physariae (Cockerell, 1907) | ⇒ Osmia giliarum Cockerell, 1906 |
| Osmia (Acanthosmioides) sladeni (Sandhouse, 1925) | ⇒ Osmia nifoata Cockerell, 1909 |
| Osmia (Acanthosmioides) unca Michener, 1937 | |
| Osmia (Cephalosmia) montana Cresson, 1864 | |
| Osmia (Cephalosmia) subaustralis Cockerell, 1900 | |
| Osmia subaustralis subaustralis | |
| Osmia (Chalcosmia) caerulescens Linnaeus, 1758 | |
| Osmia (Chenosmia) cobaltina Cresson, 1878 | |
| Osmia (Diceratosmia) conjuncta Cresson, 1864 | |
| Osmia (Helicosmia) caerulescens (Linnaeus, 1758) | ⇒ Osmia caerulescens Linnaeus, 1758 |
| Osmia (Helicosmia) coerulescens Linnaeus, 1758 | |
| Osmia (Helicosmia) coloradensis Cresson, 1878 | Colorado Osmia |
| Osmia (Melanosmia) albiventris Cresson, 1864 | |
| Osmia (Melanosmia) albolateralis Cockerell, 1906 | |
| Osmia (Melanosmia) aquilonaria Rightmyer, G..., 2010 | |
| Osmia (Melanosmia) atriventris Cresson, 1864 | Maine blueberry bee |
| Osmia (Melanosmia) atrocyanea Cockerell, 1897 | |
| Osmia (Melanosmia) brevis Cresson, 1864 | |
| Osmia (Melanosmia) bruneri Cockerell, 1897 | |
| Osmia (Melanosmia) bucephala Cresson, 1864 | Bufflehead Mason Bee |
| Osmia (Melanosmia) collinsiae Robertson, 1905 | Collinsia Mason |
| Osmia (Melanosmia) densa Cresson, 1864 | |
| Osmia (Melanosmia) distincta Cresson, 1864 | Distinct Mason Bee |
| Osmia (Melanosmia) felti Cockerell, 1911 | |
| Osmia (Melanosmia) hendersoni Cockerell, 1907 | |
| 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) laeta Sandhouse, 1924 | |
| Osmia (Melanosmia) malina Cockerell, 1909 | |
| Osmia (Melanosmia) maritima Friese, 1885 | |
| Osmia (Melanosmia) nanula Cockerell, 1897 | |
| Osmia (Melanosmia) nearctica Rightmyer, G..., 2010 | |
| Osmia (Melanosmia) nigriventris Zetterstedt, 1838 | |
| Osmia (Melanosmia) paradisica Sandhouse, 1924 | |
| Osmia (Melanosmia) proxima Cresson, 1864 | |
| Osmia (Melanosmia) pulsatillae Cockerell, 1907 | |
| Osmia (Melanosmia) pumila Cresson, 1864 | Dwarf Mason Bee |
| Osmia (Melanosmia) sandhouseae Mitchell, 1927 | |
| Osmia (Melanosmia) simillima Smith, 1853 | Similar Mason Bee |
| Osmia (Melanosmia) tersula Cockerell, 1912 | Wide-Banded Mason Bee |
| Osmia (Melanosmia) texana Cresson, 1872 | Texas Mason Bee |
| Osmia (Melanosmia) tristella Cockerell, 1897 | |
| Osmia (Melanosmia) virga Sandhouse, 1939 | Twig Mason Bee |
| Osmia (Mystacosmia) nemoris Sandhouse, 1924 | |
| Osmia (Nothosmia) atriventris (Cresson, 1864) | ⇒ Osmia atriventris Cresson, 1864 |
| Osmia (Osmia) cornifrons Radoszkowski, 1887 | Horn-faced bee |
| Osmia (Osmia) lignaria Say, 1837 | Blue orchard bee |
| Osmia (Osmia) taurus Smith, 1873 | Alternate-leaf dogwood |
| Osmia (Pyrosmia) pusilla Cresson, 1864 | |
| Osmia bella (Cresson, 1878) | ⇒ Osmia cobaltina Cresson, 1878 |
| Osmia canadensis Cresson, 1864 | |
| Osmia dolerosa Sandhouse, 1939 | |
| Osmia fervida (Smith, 1853) | ⇒ Megachile perplexa Smith, 1853 |
| Osmia gibbosa (Friese, 1909) | ⇒ Heriades gibbosa Friese, 1909 |
| Osmia hudsonica Cresson, 1864 | |
| Osmia laticella van der Zanden, 1986 | |
| Osmia laticeps Thomson, 1872 | Alfilaree |
| Osmia melanota Morawitz, 1888 | |
| Osmia michiganensis Mitchell, 1962 | |
| Osmia novaescotiae Cockerell, 1912 | |
| Osmia pentstemonis Cockerell, 1906 | |
| Osmia phaceliae Cockerell, 1907 | |
| Osmia potentillae Michener, 1936 | |
| Osmia pumilla | |
| Osmia tanneri Sandhouse, 1939 | |
| Osmia tarsata Provancher, 1888 | Freckled milkvetch |
| Osmia trevoris Cockerell, 1897 | |
| Prochelostoma philadelphi (Robertson, 1891) | ⇒ Chelostoma philadelphi Robertson, 1891 |
| Stelis (Dolichostelis) louisae Cockerell, 1911 | |
| Stelis (Stelidium) ashmeadiella | |
| Stelis (Stelis) carnifex Cockerell, 1911 | |
| Stelis (Stelis) coarctatus Crawford, 1916 | Constrained Cuckoo Carder Bee |
| 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) subemarginata Cresson, 1878 | |
| Stelis ashmeadiellae Timberlake, 1941 | |
| Stelis calliphorina Cockerell, 1911 | |
| Stelis foederalis Smith, 1854 | Federal Cuckoo Carder Bee |
| Stelis nitida Cresson, 1878 | |
| Stelis occidentalis Parker & Gri..., 2013 | |
| Stelis rubi Cockerell, 1898 | |
| Stelis vernalis Mitchell, 1962 | |
