| Anthophora (Anthophoroides) californica Cresson, 1869 | California Anthophora |
| Anthophora (Clisodon) furcata Panzer, 1798 | Fork Tailed Flower Bee |
| Anthophora (Clisodon) terminalis Cresson, 1869 | Orange-Tipped Wood-Digger Bee |
| Anthophora (Heliophila) maculifrons Cresson, 1879 | |
| Anthophora (Heliophila) petrophila Cockerell, 1905 | |
| Anthophora (Heliophila) squammulosa Dours, 1869 | |
| Anthophora (Lophanthophora) pacifica Cresson, 1878 | |
| Anthophora (Lophanthophora) ursina Cresson, 1869 | |
| Anthophora (Melea) abrupta Say, 1837 | Vegetable hummingbird |
| Anthophora (Melea) bomboides Kirby, 1837 | Bumble-bee-mimic Anthophora |
| Anthophora (Melea) occidentalis Cresson, 1869 | Digger bee |
| Anthophora (Mystacanthophora) montana Cresson, 1869 | Rocky Mountain Anthophora |
| Anthophora (Mystacanthophora) urbana Cresson, 1878 | |
| Anthophora (Pyganthophora) crotchii Cresson, 1878 | Crotch´s Anthophora |
| Anthophora (Pyganthophora) edwardsii Cresson, 1878 | |
| Anthophorula (Anthophorula) compactula Cockerell, 1897 | |
| Anthophorula (Anthophorula) completa Cockerell, 1935 | |
| Apis (Apis) mellifera Linnaeus, 1758 | Drone-Bee |
| Bombus (Alpinobombus) balteatus Dahlbom, 1832 | Baltic bumblebee |
| Bombus (Alpinobombus) hyperboreus Schönherr, 1809 | Great arctic bumblebee |
| Bombus (Alpinobombus) neoboreus (Sladen, 1919) | ⇒ Bombus strenuus Cresson, 1863 |
| Bombus (Bombias) auricomus Robertson, 1903 | Black and gold bumble bee |
| Bombus (Bombus) affinis Cresson, 1863 | Rusty patch bumble bee |
| Bombus (Bombus) lucorum (Linnaeus, 1761) | ⇒ Bombus lantschouensis Vogt, 1908 |
| Bombus (Bombus) nevadensis Cresson, 1874 | Nevada bumble bee |
| Bombus (Bombus) occidentalis (Greene, 1858) | ⇒ Bombus terricola Kirby, 1837 |
| Bombus (Bombus) terricola Kirby, 1837 | Yellow-banded Bumble Bee |
| Bombus (Crotchiibombus) crotchii Cresson, 1878 | Crotch bumble bee |
| Bombus (Cullumanobombus) rufocinctus Cresson, 1863 | Red-belted Bumble Bee |
| Bombus (Fervidobombus) californicus (Smith, 1854) | ⇒ Bombus fervidus Fabricius, 1798 |
| Bombus (Fervidobombus) fervidus Fabricius, 1798 | Golden Northern Bumble Bee |
| Bombus (Fervidobombus) pensylvanicus De Geer, 1773 | American bumble bee |
| Bombus (Fraternobombus) fraternus Smith, 1854 | Southern plains bumble bee |
| Bombus (Psithyrus) ashtoni Cresson, 1864 | Ashton cuckoo bumble bee |
| Bombus (Psithyrus) bohemicus Seidl, 1837 | Ashton's Cuckoo Bumblebee |
| Bombus (Psithyrus) citrinus Smith, 1854 | Lemon cuckoo bumble bee |
| Bombus (Psithyrus) fernaldae (Franklin, 1911) | ⇒ Bombus flavidus Eversmann, 1852 |
| Bombus (Psithyrus) insularis (Smith, 1861) | ⇒ Bombus hypnorum Linnaeus, 1758 |
| Bombus (Psithyrus) suckleyi Greene, 1860 | Suckley Cuckoo Bumble Bee |
| Bombus (Psithyrus) variabilis (Cresson, 1872) | ⇒ Bombus humilis Illiger, 1806 |
| Bombus (Pyrobombus) bifarius Cresson, 1878 | Black-notched Bumble Bee |
| Bombus (Pyrobombus) bimaculatus Cresson, 1863 | Two-spotted Bumble Bee |
| Bombus (Pyrobombus) caliginosus Frison, 1927 | Fog-belt Bumble Bee |
| Bombus (Pyrobombus) centralis Cresson, 1864 | Central bumble bee |
| Bombus (Pyrobombus) flavifrons Cresson, 1863 | Yellow head bumble bee |
| Bombus (Pyrobombus) frigidus Smith, 1854 | Frigid Bumble Bee |
| Bombus (Pyrobombus) huntii Greene, 1860 | Hunt bumble bee |
| Bombus (Pyrobombus) hypnorum Linnaeus, 1758 | New garden bumblebee |
| Bombus (Pyrobombus) impatiens Cresson, 1863 | Common eastern bumble bee |
| Bombus (Pyrobombus) melanopygus Nylander, 1848 | Black tail bumble bee |
| Bombus (Pyrobombus) mixtus Cresson, 1878 | Fuzzy-horned bumble bee |
| Bombus (Pyrobombus) perplexus (Cresson, 1863) | ⇒ Bombus soroeensis Fabricius, 1776 |
| Bombus (Pyrobombus) pratorum Illiger, 1806 | Apple Bumblebee |
| Bombus (Pyrobombus) sandersoni Franklin, 1913 | Sanderson bumble bee |
| Bombus (Pyrobombus) sitkensis Nylander, 1848 | Sitka bumble bee |
| Bombus (Pyrobombus) sylvicola Kirby, 1837 | Forest bumble bee |
| Bombus (Pyrobombus) ternarius Say, 1837 | Orange-belted Bumble Bee |
| Bombus (Pyrobombus) vagans Smith, 1854 | Half-black bumble bee |
| Bombus (Pyrobombus) vosnesenskii Radoszkowski, 1862 | Vosnesensky bumble bee |
| Bombus (Separatobombus) griseocollis (DeGeer, 1773) | ⇒ Bombus griseocollis De Geer, 1773 |
| Bombus (Separatobombus) morrisoni (Cresson, 1878) | ⇒ Bombus morrisoni Cresson, 1878 |
| Bombus (Subterraneobombus) appositus Cresson, 1878 | Mountain Bumble Bee |
| Bombus (Subterraneobombus) borealis Kirby, 1837 | Northern amber bumble bee |
| Bombus fervidas | Golden Northern Bumble Bee |
| Bombus pennsylvanicus (De Geer, 1773) | ⇒ Bombus pensylvanica De Geer, 1773 |
| Bombus sg | |
| Centris (Paracentris) caesalpiniae Cockerell, 1897 | |
| Ceratina (Ceratinula) arizonensis Cockerell, 1898 | Arizona Ceratina |
| Ceratina (Zadontomerus) acantha Provancher, 1895 | Prickly Ceratina |
| Ceratina (Zadontomerus) calcarata Robertson, 1900 | Spurred Carpenter Bee |
| Ceratina (Zadontomerus) dupla (Say, 1837) | ⇒ Ceratina floridana Mitchell, 1962 |
| Ceratina (Zadontomerus) melanoptera Cockerell, 1924 | |
| Ceratina (Zadontomerus) nanula Cockerell, 1897 | Dwarf Ceratina |
| Ceratina (Zadontomerus) neomexicana Cockerell, 1901 | |
| Ceratina (Zadontomerus) pacifica H. S. Smith, 1907 | |
| Ceratina (Zadontomerus) punctigena van der Vecht, 1952 | |
| Ceratina (Zadontomerus) strenua Smith, 1879 | Bunchberry dogwood |
| Ceratina mikmaqi Rehan & Shef..., 2011 | Mikmaq Little Carpenter Bee |
| Diadasia (Coquillettapis) afflicta Cresson, 1878 | |
| Diadasia (Coquillettapis) australis Cresson, 1878 | |
| Diadasia (Coquillettapis) diminuta Cresson, 1878 | |
| Diadasia (Coquillettapis) rinconis Cockerell, 1897 | |
| Diadasia (Dasiapis) ochracea Cockerell, 1903 | Ochraceous Chimney Bee |
| Diadasia (Diadasia) enavata Cresson, 1872 | Sunflower Chimney Bee |
| Elaphropoda bembidion Lieftinck, 1966 | Cascade cave amphipod |
| Epeoloides pilosula (Cresson, 1878) | ⇒ Epeoloides pilosulus Cresson, 1878 |
| Epeolus americanus Cresson, 1878 | |
| Epeolus autumnalis Robertson, 1902 | Autumnal Cellophane-Cuckoo |
| Epeolus bifasciatus Cresson, 1864 | Two-Banded Cellophane-Cuckoo |
| Epeolus canadensis Mitchell, 1962 | Canadian Cellophane-Cuckoo Bee |
| Epeolus compactus Cresson, 1878 | |
| Epeolus gabrielis Cockerell, 1909 | |
| Epeolus interruptus Robertson, 1900 | |
| Epeolus lanhami Mitchell, 1962 | |
| Epeolus lectoides Robertson, 1901 | Knotted clover |
| Epeolus mercatus Fabricius, 1804 | Aleutian macoma |
| Epeolus minimus Robertson, 1902 | Least Cellophane-Cuckoo Bee |
| Epeolus pusillus Cresson, 1864 | Dwarf Cellophane-Cuckoo Bee |
| Epeolus scutellaris Say, 1824 | Notch-Backed Cellophane-Cuckoo Bee |
| Eucera (Eucera) longicornis Linnaeus, 1758 | Long-horned Bee |
| Eucera (Synhalonia) amsinckiae Timberlake, 1969 | |
| Eucera (Synhalonia) atriventris Smith, 1854 | |
| Eucera (Synhalonia) dubitata Cresson, 1878 | |
| Eucera (Synhalonia) hamata Bradley, 1942 | |
| Eucera (Synhalonia) speciosa Cresson, 1878 | |
| Eucera virgata Cockerell, 1905 | |
| Exomalopsis (Stilbomalopsis) solani Cockerell, 1896 | Solanum Exomalopsis |
| Florilegus (Florilegus) condignus Cresson, 1878 | |
| Habropoda laboriosa Fabricius, 1804 | Blueberry Habropoda |
| Holcopasites calliopsidis Linsley, 1943 | Calliopsis Cuckoo Nomad Bee |
| Holcopasites eamia Cockerell, 1909 | |
| Holcopasites heliopsis Robertson, 1897 | |
| Holcopasites illinoiensis Robertson, 1891 | |
| Holcopasites stevensi Crawford, 1915 | |
| Melecta thoracica Cresson, 1875 | |
| Melissodes (Callimelissodes) coloradensis Cresson, 1878 | |
| Melissodes (Callimelissodes) glenwoodensis Cockerell, 1905 | |
| Melissodes (Callimelissodes) lupina Cresson, 1878 | |
| Melissodes (Eumelissodes) agilis Cresson, 1878 | Agile Long-horned Bee |
| Melissodes (Eumelissodes) boltoniae Robertson, 1905 | Subterranean clover |
| Melissodes (Eumelissodes) confusa Cresson, 1878 | |
| Melissodes (Eumelissodes) coreopsis Robertson, 1905 | Subterranean clover |
| Melissodes (Eumelissodes) denticulata Smith, 1854 | |
| Melissodes (Eumelissodes) dentiventris Smith, 1854 | |
| Melissodes (Eumelissodes) druriella Kirby, 1802 | |
| Melissodes (Eumelissodes) gelida LaBerge, 1961 | |
| Melissodes (Eumelissodes) grindeliae Cockerell, 1898 | |
| Melissodes (Eumelissodes) hymenoxidis Cockerell, 1906 | |
| Melissodes (Eumelissodes) illata Lovell & Coc..., 1906 | |
| Melissodes (Eumelissodes) lutulenta LaBerge, 1961 | |
| Melissodes (Eumelissodes) menuachus Cresson, 1868 | |
| Melissodes (Eumelissodes) microsticta Cockerell, 1905 | |
| Melissodes (Eumelissodes) pallidisignata Cockerell, 1905 | |
| Melissodes (Eumelissodes) semilupina Cockerell, 1905 | |
| Melissodes (Eumelissodes) snowii Cresson, 1878 | |
| Melissodes (Eumelissodes) subagilis Cockerell, 1905 | |
| Melissodes (Eumelissodes) subillata LaBerge, 1961 | |
| Melissodes (Eumelissodes) tincta LaBerge, 1961 | |
| Melissodes (Eumelissodes) trinodis Robertson, 1901 | Dark-Veined Longhorn |
| Melissodes (Eumelissodes) tristis Cockerell, 1894 | |
| Melissodes (Eumelissodes) vernoniae Robertson, 1902 | |
| Melissodes (Eumelissodes) wheeleri Cockerell, 1906 | |
| Melissodes (Heliomelissodes) desponsa Smith, 1854 | Thistle Long-horned Bee |
| Melissodes (Heliomelissodes) rivalis Cresson, 1872 | |
| Melissodes (Melissodes) bimaculata Lepeletier, 1825 | Longhorn Bee |
| Melissodes (Melissodes) communis Cresson, 1878 | Common Long-horned Bee |
| Melissodes (Melissodes) comptoides Robertson, 1898 | Brown-winged Long-horned Bee |
| Melissodes (Psilomelissodes) intorta Cresson, 1872 | |
| Melitoma taurea Say, 1837 | |
| Nomada (Gnathias) bella Cresson, 1863 | Belle Nomad Bee |
| Nomada (Nomada) annulata Smith, 1854 | |
| Nomada (Nomada) banksi Cockerell, 1907 | Banks' Nomad Bee |
| Nomada (Nomada) denticulata Robertson, 1902 | Denticulate Nomad |
| Nomada (Nomada) parva Robertson, 1900 | Small Cuckoo Nomad Bee |
| Nomada (Nomada) sulphurata Smith, 1854 | |
| Nomada (Nomada) vicina Cresson, 1863 | Neighborly Nomad |
| Nomada (Nomadita) placida Cresson, 1863 | |
| Nomada affabilis Cresson, 1878 | |
| Nomada arenicola Swenk, 1913 | |
| Nomada armatella Cockerell, 1903 | Armed Cuckoo Nomad Bee |
| Nomada articulata Smith, 1854 | Articulated Nomad |
| Nomada australis Mitchell, 1962 | Austral Cuckoo Nomad Bee |
| Nomada autumnalis Mitchell, 1962 | |
| Nomada belfragei Cresson, 1878 | |
| Nomada besseyi Swenk, 1913 | |
| Nomada bethunei Cockerell, 1903 | Bethune'S Cuckoo Nomad Bee |
| Nomada binotata Robertson, 1903 | |
| Nomada bisignata Say, 1824 | |
| Nomada capitalis Mitchell, 1962 | |
| Nomada colorata Mitchell, 1962 | |
| Nomada composita Mitchell, 1962 | Composite Cuckoo Nomad Bee |
| Nomada cressonii Morawitz, 1877 | Cresson'S Nomad |
| Nomada crotchii Cresson, 1878 | |
| Nomada cuneata Robertson, 1903 | Cuneate Cuckoo Nomad Bee |
| Nomada decepta Mitchell, 1962 | |
| Nomada dentariae Robertson, 1903 | |
| Nomada depressa Cresson, 1863 | Depressed Cuckoo Nomad Bee |
| Nomada dreisbachi Mitchell, 1962 | |
| Nomada edwardsii Cresson, 1878 | Edwards´ Nomad Bee |
| Nomada florilega Lovell & Coc..., 1905 | Flower Cuckoo Nomad Bee |
| Nomada grandis Cresson, 1875 | |
| Nomada heiligbrodtii (Cresson, 1878) | ⇒ Nomada texana Cresson, 1872 |
| Nomada hemphilli Cockerell, 1903 | |
| Nomada illinoensis (Robertson, 1900) | ⇒ Nomada illinoiensis Robertson, 1900 |
| Nomada imbricata Smith, 1854 | Imbricate Cuckoo Nomad Bee |
| Nomada lehighensis Cockerell, 1903 | Lehigh Gap Cuckoo Nomad Bee |
| Nomada lepida Cresson, 1863 | Charming Cuckoo Nomad Bee |
| Nomada luteoloides (Robertson, 1895) | ⇒ Nomada sulphurata Smith, 1854 |
| Nomada maculata Cresson, 1863 | Spotted Nomad Bee |
| Nomada media Mitchell, 1962 | |
| Nomada minima Mitchell, 1962 | |
| Nomada obliterata Cresson, 1863 | Obliterated Cuckoo Nomad Bee |
| Nomada ochlerata Mitchell, 1962 | |
| Nomada ovata Robertson, 1903 | Orange-Tailed Nomad |
| Nomada perplexa Cresson, 1863 | |
| Nomada pseudops (Cockerell, 1905) | ⇒ Nomada bethunei Cockerell, 1903 |
| Nomada pygmaea Cresson, 1863 | Pygmy Cuckoo Nomad Bee |
| Nomada rubi Swenk, 1915 | |
| Nomada rubicunda Olivier, 1811 | Littleleaf mockorange |
| Nomada sayi Robertson, 1893 | |
| Nomada sobrina Mitchell, 1962 | |
| Nomada sphaerogaster Cockerell, 1903 | |
| Nomada subrubi Swenk, 1915 | |
| Nomada subrutila Lovell & Coc..., 1905 | |
| Nomada superba Cresson, 1863 | Superb Nomada |
| Nomada texana Cresson, 1872 | Texas Nomad Bee |
| Nomada tiftonensis Cockerell, 1903 | Tifton Nomad Bee |
| Nomada utahensis Moalif, 1988 | Utah Nomada |
| Nomada vincta Say, 1837 | Bounded Cuckoo Nomad Bee |
| Nomada wisconsinensis (Graenicher, 1911) | ⇒ Nomada fervida Smith, 1854 |
| Peponapis (Peponapis) pruinosa Say, 1837 | Eastern cucurbit bee |
| Ptilothrix bombiformis Cresson, 1878 | Hibiscus Bee |
| Svastra (Anthedonia) compta Cresson, 1878 | |
| Svastra (Brachymelissodes) cressonii Dalla Torre, 1896 | |
| Svastra (Epimelissodes) atripes Cresson, 1872 | |
| Svastra (Epimelissodes) grandissima Cockerell, 1905 | |
| Svastra (Epimelissodes) obliqua Say, 1837 | Oblique Longhorn |
| Svastra (Epimelissodes) petulca Cresson, 1878 | |
| Svastra (Epimelissodes) texana Cresson, 1872 | |
| Svastra (Svastra) flavitarsis Spinola, 1851 | |
| Tetraloniella (Tetraloniella) albata Cresson, 1872 | |
| Thyreus sphenophorus Lieftinck, 1962 | |
| Triepeolus concavus (Cresson, 1878) | ⇒ Doeringiella concava |
| Triepeolus donatus Smith, 1854 | Thistle Longhorn-Cuckoo |
| Triepeolus eliseae Rightmyer, 2017 | |
| Triepeolus helianthi Robertson, 1897 | Sunflower Cuckoo Nomad Bee |
| Triepeolus lunatus Say, 1824 | |
| Triepeolus michiganensis Mitchell, 1962 | Michigan Cuckoo Nomad Bee |
| Triepeolus nevadensis Cresson, 1878 | |
| Triepeolus obliteratus Graenicher, 1911 | |
| Triepeolus occidentalis Cresson, 1878 | |
| Triepeolus pectoralis Robertson, 1897 | Goldenrod Longhorn-Cuckoo Bee |
| Triepeolus quadrifasciatus Say, 1823 | |
| Triepeolus remigatus Fabricius, 1804 | Hairy cockle |
| Triepeolus utahensis Cockerell, 1921 | |
| Xenoglossa (Xenoglossa) patricia Cockerell, 1896 | |
| Xeromelecta (Melectomorpha) californica Cresson, 1878 | California Xeromelecta |
| Xeromelecta (Melectomorpha) interrupta Cresson, 1872 | Interrupted Xeromelecta |
| Xylocopa (Notoxylocopa) tabaniformis Smith, 1854 | Arnold's dogwood |
| Xylocopa (Schonnherria) micans Lepeletier, 1841 | Southern Carpenter Bee |
| Xylocopa (Xylocopoides) californica Cresson, 1864 | California carpenter bee |
| Xylocopa (Xylocopoides) virginica Linnaeus, 1771 | Carpenter bee |
| Zacosmia maculata Cresson, 1879 | |
