| Acanthomyops coloradensis Wheeler, 1917 | |
| Agapostemon (Agapostemon) angelicus Cockerell, 1924 | |
| Agapostemon (Agapostemon) melliventris Cresson, 1874 | Honey-bellied Agapostemon |
| Ammophila aberti Haldeman, 1852 | Winged stilt crab |
| Ammophila macra Cresson, 1865 | Winged surfclam |
| Ammophila pruinosa Cresson, 1865 | Winged surfclam |
| Andrena (Andrena) saccata Viereck, 1904 | |
| Andrena (Holandrena) cressonii Robertson, 1891 | Cresson'S Mining Bee |
| Andrena (Melandrena) nivalis Smith, 1853 | Snowy Andrena |
| Andrena (Micrandrena) illinoiensis Robertson, 1891 | |
| Andrena (Micrandrena) piperi Viereck, 1904 | |
| Andrena (Scaphandrena) scurra Viereck, 1904 | |
| Andrena (Scaphandrena) walleyi Cockerell, 1932 | |
| Andrena (Scrapteropsis) imitatrix Cresson, 1872 | Imitator Miner Bee |
| Andrena (Simandrena) pallidifovea Viereck, 1904 | Pale-fovea Andrena |
| Andrena (Thysandrena) candida Smith, 1879 | Bunchberry dogwood |
| Andrena (Thysandrena) medionitens Cockerell, 1902 | |
| Andrena (Trachandrena) hippotes Robertson, 1895 | Hippotes'S Miner Bee |
| Andrena (Tylandrena) subtilis Smith, 1879 | Bunchberry dogwood |
| Andrena (Tylandrena) wilmattae Cockerell, 1906 | |
| Andrena sulcata Donovan, 1977 | |
| Anthidium (Anthidium) banningense Cockerell, 1904 | |
| Anthidium (Callanthidium) illustre Cresson, 1879 | |
| Anthophora (Anthophoroides) californica Cresson, 1869 | California Anthophora |
| Anthophora (Heliophila) curta (Provancher, 1895) | ⇒ Anthophora squammulosa Dours, 1869 |
| Anthophora (Heliophila) exigua Cresson, 1879 | |
| Anthophora (Heliophila) maculifrons Cresson, 1879 | |
| Anthophora (Heliophila) peritomae Cockerell, 1905 | |
| Anthophora (Lophanthophora) neglecta Timberlake &..., 1936 | |
| Anthophora (Lophanthophora) porterae Cockerell, 1900 | |
| Anthophora (Melea) bomboides Kirby, 1837 | Bumble-bee-mimic Anthophora |
| Anthophora (Melea) occidentalis Cresson, 1869 | Digger bee |
| Anthophora (Pyganthophora) lesquerellae Cockerell, 1896 | |
| Aphaenogaster occidentalis Emery, 1895 | |
| Aphaenogaster uinta Wheeler, 1917 | Sickle jackknife |
| Apis (Apis) mellifera Linnaeus, 1758 | Drone-Bee |
| Ashmeadiella (Arogochila) australis Cockerell, 1902 | |
| Ashmeadiella (Ashmeadiella) foveata Michener, 1939 | |
| Augochlora (Augochlora) pura Say, 1837 | Augochlora Sweat Bee |
| Augochlorella pomoniella Cockerell, 1915 | |
| Bembix amoena Handlirsch, 1893 | |
| Bombus (Bombus) affinis Cresson, 1863 | Rusty patch bumble bee |
| Bombus (Bombus) lucorum (Linnaeus, 1761) | ⇒ Bombus lantschouensis Vogt, 1908 |
| Bombus (Bombus) occidentalis (Greene, 1858) | ⇒ Bombus terricola Kirby, 1837 |
| Bombus (Bombus) terricola Kirby, 1837 | Yellow-banded Bumble Bee |
| Bombus (Fervidobombus) fervidus Fabricius, 1798 | Golden Northern Bumble Bee |
| Bombus (Fervidobombus) pensylvanicus De Geer, 1773 | American bumble bee |
| Bombus (Pyrobombus) bifarius Cresson, 1878 | Black-notched Bumble Bee |
| Bombus (Pyrobombus) bimaculatus Cresson, 1863 | Two-spotted Bumble Bee |
| Bombus (Pyrobombus) flavifrons Cresson, 1863 | Yellow head bumble bee |
| Bombus (Pyrobombus) huntii Greene, 1860 | Hunt bumble bee |
| Bombus (Pyrobombus) impatiens Cresson, 1863 | Common eastern bumble bee |
| Bombus (Pyrobombus) mixtus Cresson, 1878 | Fuzzy-horned bumble bee |
| Bombus (Pyrobombus) ternarius Say, 1837 | Orange-belted 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 |
| Camponotus (Camponotus) herculeanus Linnaeus, 1758 | Black carpenter ant |
| Camponotus (Camponotus) pennsylvanicus (De Geer, 1773) | ⇒ Camponotus pensylvanica De Geer, 1773 |
| Camponotus (Tanaemyrmex) sansabeanus Buckley, 1866 | |
| Camponotus (Tanaemyrmex) vicinus Mayr, 1870 | Maculate carpenter ant |
| Cerceris convergens Viereck & Co..., 1904 | |
| Cerceris nigrescens Smith, 1856 | |
| Chalybion californicum Saussure, 1867 | Blue mud dauber |
| Chorebus gyrinus Marshall, 1895 | |
| Clitemnestra bipunctata Say, 1824 | |
| Colletes louisae Cockerell, 1897 | |
| Crematogaster (Crematogaster) cerasi Fitch, 1855 | |
| Crematogaster (Crematogaster) depilis Wheeler, W.M., 1919 | |
| Crematogaster (Crematogaster) laeviuscula Mayr, 1870 | |
| Crematogaster (Crematogaster) lineolata Say, 1836 | |
| Dasymutilla occidentalis Linnaeus, 1758 | Common Eastern Velvet Ant |
| Diadasia (Coquillettapis) australis Cresson, 1878 | |
| Diadasia (Coquillettapis) nitidifrons Cockerell, 1905 | |
| Dianthidium (Dianthidium) cressonii Dalla Torre, 1896 | |
| Dianthidium (Dianthidium) curvatum Smith, 1854 | |
| Dianthidium (Dianthidium) ulkei Cresson, 1878 | |
| Diplolepis rosae Linnaeus, 1758 | Bedeguar gall |
| Dolerus similis Norton, 1861 | |
| Dolichovespula (Dolichovespula) maculata Linnaeus, 1763 | Bald hornet |
| Elampus marginatus (Patton, 1879) | ⇒ Omalus iridescens Norton, 1879 |
| Elaphropoda bembidion Lieftinck, 1966 | Cascade cave amphipod |
| Enicospilus miscophus Gauld & Mitc..., 1981 | |
| Entypus unifasciatus Say, 1828 | Eastern Tawny-Horned Spider Wasp |
| Erigorgus curtus Norton, 1863 | |
| Formica (Serviformica) fusca (Linnaeus, 1758) | ⇒ Tetramorium caespitum Linnaeus, 1758 |
| Formica argentea Wheeler, W.M., 1912 | Silvery Field Ant |
| Formica aserva Forel, 1901 | Round combshell |
| Formica coloradensis Creighton, 1940 | |
| Formica gnava Buckley, 1866 | |
| Formica lasioides Emery, 1893 | Tapered pigtoe |
| Formica neoclara Emery, 1893 | Tapered pigtoe |
| Formica neogagates Viereck, 1903 | New World Black Ant |
| Formica puberula Emery, 1893 | Tapered pigtoe |
| Formica subaenescens Emery, 1893 | Tapered pigtoe |
| Formica subnitens Creighton, 1940 | |
| Formica xerophila Smith, M.R., 1939 | Eggleaf silktassel |
| Formicoxenus hirticornis Emery, 1895 | |
| Gasteruption assectator Linnaeus, 1758 | |
| Gelis utahensis Strickland, 1912 | |
| Habropoda laboriosa Fabricius, 1804 | Blueberry Habropoda |
| Halictus (Monilapis) confusus Smith, 1853 | Confusing Furrow Bee |
| Halictus (Nealictus) farinosus (Smith, 1853) | ⇒ Halictus farinosus Smith, 1853 |
| Halictus (Odontalictus) ligatus Say, 1837 | Ligated Furrow Bee |
| Halictus (Protohalictus) rubicundus (Christ, 1791) | ⇒ Halictus rubicundus Christ, 1791 |
| Halictus (Seladonia) tripartitus Cockerell, 1895 | |
| Holopyga ventralis | |
| Hoplitis (Cyrtosmia) hypocrita Cockerell, 1906 | |
| Hylaeus (Prosopis) affinis Smith, 1853 | Eastern Masked Bee |
| Hylaeus (Prosopis) episcopalis Cockerell, 1896 | |
| Lasioglossum (Dialictus) diversopunctatum Ellis, 1914 | |
| Lasioglossum (Dialictus) hyalinum Crawford, 1907 | |
| Lasioglossum (Dialictus) microlepoides Ellis, 1914 | Sweat bee |
| Lasioglossum (Dialictus) sandhouseae (Michener, 1951) | ⇒ Lasioglossum testaceum Robertson, 1897 |
| Lasioglossum (Dialictus) versatum Robertson, 1902 | Experienced Sweat Bee |
| Lasioglossum (Dialictus) zephyrum Smith, 1853 | Zephyr Dialictus |
| Lasioglossum (Lasioglossum) lampronotum McGinley, 1986 | |
| Lasioglossum (Lasioglossum) sisymbrii Cockerell, 1895 | |
| Lasius (Acanthomyops) claviger Roger, 1862 | Common Citronella Ant |
| Lasius (Chthonolasius) umbratus Nylander, 1846 | Yellow ant |
| Lasius (Lasius) alienus Foerster, 1850 | Alien field ant |
| Lasius (Lasius) neoniger Emery, 1893 | Cornfield ant |
| Lasius brevicornis (Nylander, 1846) | ⇒ Lasius flavus Fabricius, 1782 |
| Lasius sitiens Wilson, 1955 | Elongate macoma |
| Leptothorax (Leptothorax) crassipilis Wheeler, W.M., 1917 | Sickle jackknife |
| Liometopum luctuosum Wheeler, W.M., 1905 | Pine tree ant |
| Liometopum occidentale Emery, 1895 | Beaver-tail fairy shrimp |
| Macrotera (Macroteropsis) arcuata Fox, 1893 | |
| Megachile (Eutricharaea) concinna Smith, 1853 | Elegant leaf-cutter bee |
| Megachile (Litomegachile) brevis (Say, 1837) | ⇒ Megachile pseudobrevis Mitchell, 1934 |
| Megachile (Litomegachile) lippiae Cockerell, 1900 | |
| Megachile (Megachiloides) wheeleri Mitchell, 1927 | |
| Megachile (Megachiloides) xerophila Cockerell, 1933 | |
| Megachile (Xanthosarus) latimanus Say, 1823 | Broad-handed Leaf-cutter Bee |
| Megachile subanograe Mitchell, 1934 | |
| Megarhyssa macrura Linnaeus, 1771 | Long-Tailed Giant Ichneumonid Wasp |
| Melissodes (Eumelissodes) agilis Cresson, 1878 | Agile Long-horned Bee |
| Melissodes (Eumelissodes) coreopsis Robertson, 1905 | Subterranean clover |
| Melissodes (Eumelissodes) druriella Kirby, 1802 | |
| Melissodes (Eumelissodes) hymenoxidis Cockerell, 1906 | |
| Melissodes (Melissodes) bimaculata Lepeletier, 1825 | Longhorn Bee |
| Melissodes (Tachymelissodes) dagosa Cockerell, 1909 | |
| Monomorium ergatogyna Wheeler, 1904 | |
| Monomorium minimum (Buckley, 1867) | ⇒ Monomorium cyaneum Wheeler, 1914 |
| Monomorium opacior Forel, 1913 | |
| Myrmecocystus navajo Wheeler, W.M., 1908 | Rough razor |
| Myrmecocystus semirufus Emery, 1893 | Tapered pigtoe |
| Myrmica fracticornis Forel, 1901 | Round combshell |
| Myrmica latifrons Stärcke, 1927 | Corded pitar |
| Myrmica rubra (Linnaeus, 1758) | ⇒ Labidus coecus Latreille, 1802 |
| Myrmica scabrinodis Nylander, 1846 | Ant |
| Myrmica tahoensis Weber, 1948 | |
| Neivamyrmex nigrescens Cresson, 1872 | |
| Neolarra californica Michener, 1939 | |
| Nomada cressonii Morawitz, 1877 | Cresson'S Nomad |
| Nomia (Acunomia) melanderi Cockerell, 1906 | Alkali bee |
| Nylanderia melanderi arenivaga Wheeler, 1905 | |
| Ocymyrmex tachys Bolton & Marsh, 1989 | |
| Ooencyrtus aphidius Dang & Wang, 2002 | |
| Osmia (Cephalosmia) californica Cresson, 1864 | |
| Osmia (Cephalosmia) montana Cresson, 1864 | |
| Osmia (Helicosmia) coloradensis Cresson, 1878 | Colorado Osmia |
| Osmia (Melanosmia) brevis Cresson, 1864 | |
| Osmia (Melanosmia) cyanella Cockerell, 1897 | |
| Osmia (Melanosmia) grindeliae Cockerell, 1910 | |
| Osmia (Mystacosmia) nemoris Sandhouse, 1924 | |
| Osmia (Osmia) lignaria Say, 1837 | Blue orchard bee |
| Osmia (Osmia) ribifloris Cockerell, 1900 | Blueberry bee |
| Osmia ednae (Cockerell, 1907) | ⇒ Osmia calla Cockerell, 1897 |
| Osmia trevoris Cockerell, 1897 | |
| Perdita (Perdita) zebrata Cresson, 1878 | |
| Perdita (Pygoperdita) leucostoma Timberlake, 1956 | |
| Pheidole ceres Wheeler, 1904 | |
| Pheidole dentata Mayr, 1886 | Cande diplodon |
| Pheidole desertorum Wheeler, 1906 | |
| Philanthus gibbosus Fabricius, 1775 | Bee wolf |
| Pogonomyrmex barbatus Smith, 1858 | Agricultural ant |
| Pogonomyrmex maricopa Wheeler, 1914 | Maricopa harvester ant |
| Pogonomyrmex subnitidus Emery, 1895 | Turgid blossom |
| Polistes (Aphanilopterus) aurifer (Saussure, 1853) | ⇒ Polistes fuscata Fabricius, 1793 |
| Polistes (Aphanilopterus) fuscatus Fabricius, 1793 | Dark Paper Wasp |
| Polyrhachis laevigata Smith, F., 1857 | Dosinia lucine |
| Ponera pennsylvanica Buckley, 1866 | Pennsylvania Ponera |
| Prenolepis imparis Say, 1836 | False Honey Ant |
| Prosacantha utahensis | |
| Solenopsis (Diplorhoptrum) molesta (Say, 1836) | ⇒ Diplorhoptrum molestum Emery, 1895 |
| Solierella peckhami Ashmead, 1897 | Crabronid wasp |
| Solierella sonorae Williams, 1950 | |
| Sphex ichneumoneus Linnaeus, 1758 | Great Golden Digger |
| Steniolia elegans Parker, 1929 | |
| Tachysphex ashmeadii Fox, 1894 | |
| Tapinoma sessile Say, 1836 | Coconut ant |
| Temnothorax andrei Emery, 1895 | |
| Tremex columba Linnaeus, 1763 | Pigeon tremex |
| Trichiosoma triangulum Kirby, 1837 | Giant birch sawfly |
| Triepeolus lunatus Say, 1824 | |
| Urocerus californicus Norton, 1869 | |
| Xylocopa (Xylocopoides) virginica Linnaeus, 1771 | Carpenter bee |
