| Family | genus | species | author | Type Number | Category |
| Colletidae | Caupolicana | wilsoni | Reed | 13523 | syntypes, 4 |
| Colletidae | Chilicola | andina | Toro and Moldenke | 13124 | holotype |
| Colletidae | Chilicola | hahni | Herbst | 13126 | syntype |
| Colletidae | Chilicola | michelbacheri | Toro and Moldenke | 13125 | holotype |
| Colletidae | Colletes | albocinctus | Cockerell | 1498 | holotype |
| Colletidae | Colletes | algarobiae | Cockerell | 15559 | syntype |
| Colletidae | Colletes | andrewsi | Cockerell | 15560 | holotype |
| Colletidae | Colletes | angelicus | Cockerell | 15561 | holotype |
| Colletidae | Colletes | bryanti | Timberlake | 6623 | holotype |
| Colletidae | Colletes | cauponarius | Cockerell | 15562 | holotype |
| Colletidae | Colletes | cercidii | Timberlake | 14883 | holotype |
| Colletidae | Colletes | chamaesarachae | Cockerell | 15563 | holotype |
| Colletidae | Colletes | cismontanus | Timberlake | 14884 | holotype |
| Colletidae | Colletes | cockerelli | Timberlake | 15564 | holotype |
| Colletidae | Colletes | coloradensis | Cockerell | 15565 | holotype |
| Colletidae | Colletes | covilleae | Timberlake | 14885 | holotype |
| Colletidae | Colletes | deserticola | Timberlake | 6624 | holotype |
| Colletidae | Colletes | disseptus | Timberlake | 14886 | holotype |
| Colletidae | Colletes | eriogoni | Cockerell | 14887 | holotype |
| Colletidae | Colletes | florissantia | Cockerell | 15566 | holotype |
| Colletidae | Colletes | gypsicolens | Cockerell | 15567 | syntype |
| Colletidae | Colletes | hyalinus oregonensis | Timberlake | 14888 | holotype |
| Colletidae | Colletes | hydrophilus | Cockerell | 15568 | holotype |
| Colletidae | Colletes | kobensis | Cockerell | 2387 | holotype |
| Colletidae | Colletes | larreae | Timberlake | 14889 | holotype |
| Colletidae | Colletes | laticinctus | Timberlake | 14890 | holotype |
| Colletidae | Colletes | linsleyi | Timberlake | 14891 | holotype |
| Colletidae | Colletes | lippiarum | Cockerell | 15569 | holotype |
| Colletidae | Colletes | monticola interior | Timberlake | 6626 | holotype |
| Colletidae | Colletes | monticola inyoensis | Timberlake | 6625 | holotype |
| Colletidae | Colletes | monticola pinorum | Timberlake | 14893 | holotype |
| Colletidae | Colletes | monticola | Timberlake | 14892 | holotype |
| Colletidae | Colletes | mulegensis | Cockerell | 1499 | holotype |
| Colletidae | Colletes | myroni | Cockerell | 15570 | holotype |
| Colletidae | Colletes | nitescens | Timberlake | 14894 | holotype |
| Colletidae | Colletes | nitidicaudus | Cockerell | 15571 | holotype |
| Colletidae | Colletes | paniscus mertensiae | Timberlake | 14895 | holotype |
| Colletidae | Colletes | paniscus sculleni | Timberlake | 14896 | holotype |
| Colletidae | Colletes | peninsularis | Timberlake | 6627 | holotype |
| Colletidae | Colletes | perileucus | Cockerell | 1501 | holotype |
| Colletidae | Colletes | phaceliae | Cockerell | 15572 | holotype |
| Colletidae | Colletes | polemonii | Cockerell | 15573 | holotype |
| Colletidae | Colletes | profectus | Cockerell | 1500 | holotype |
| Colletidae | Colletes | rudis | Timberlake | 14897 | holotype |
| Colletidae | Colletes | rufocinctus | Cockerell | 15574 | holotype |
| Colletidae | Colletes | salicicola geranii | Cockerell | 15576 | syntypes, 2 |
| Colletidae | Colletes | salicicola | Cockerell | 15575 | holotype |
| Colletidae | Colletes | sieverti | Cockerell | 15577 | holotype |
| Colletidae | Colletes | slevini | Cockerell | 1648 | holotype |
| Colletidae | Colletes | solitarius | Timberlake | 6628 | holotype |
| Colletidae | Colletes | sphaeralceae | Timberlake | 14898 | holotype |
| Colletidae | Colletes | stepheni | Timberlake | 14899 | holotype |
| Colletidae | Colletes | tectiventris | Timberlake | 14900 | holotype |
| Colletidae | Colletes | trigonatus | Cockerell | 15578 | holotype |
| Colletidae | Colletes | tucsonensis | Cockerell | 15579 | holotype |
| Colletidae | Colletes | turgiventris | Timberlake | 14901 | holotype |
| Colletidae | Colletes | vandykei | Timberlake | 6629 | holotype |
| Colletidae | Colletes | wilmattae | Cockerell | 15580 | holotype |
| Colletidae | Colletes | xerophilus sonoranus | Timberlake | 15581 | holotype |
| Colletidae | Colletes | xerophilus | Timberlake | 14902 | holotype |
| Colletidae | Eulonchopria | oaxacana | Michener | 11396 | holotype |
| Colletidae | Euryglossa | nitidifrons serrata | Cockerell | 15582 | syntype |
| Colletidae | Euryglossella | nothula | Cockerell | 15583 | syntypes, 3 |
| Colletidae | Hylaeus | giffardiellus | Cockerell | 1649 | holotype |
| Colletidae | Hylaeus | insolitus | Snelling | 9540 | holotype |
| Colletidae | Hylaeus | sonorensis melanorhinus | Cockerell | 1497 | holotype |
| Colletidae | Hylaeus | sonorensis | Cockerell | 1496 | holotype |
| Colletidae | Leioproctus | alloeopus | Maynard | 17258 | holotype |
| Colletidae | Megacilissa | thoracica | Fox | 262 | holotype |
| Colletidae | Prosopis | bacillaria | Cockerell | 15584 | syntype |
| Colletidae | Prosopis | eugeniella | Cockerell | 15585 | syntype |
| Colletidae | Prosopis | flavojugata | Cockerell | 15586 | syntype |
| Colletidae | Prosopis | hesperiphila | Cockerell | 15587 | holotype |
| Colletidae | Prosopis | pulchripes | Cockerell | 15588 | syntype |
| Colletidae | Prosopis | tuertonis | Cockerell | 15589 | holotype |
| Colletidae | Prosopis | universitatis | Cockerell | 15590 | holotype |
| Colletidae | Ptiloglossa | arizonensis | Timberlake | 14904 | holotype |
| Colletidae | Ptiloglossa | jonesi | Timberlake | 14905 | holotype |