| Family | genus | species | author | Type Number | Category |
| Megachilidae | Anthidiellum | robertsoni citrinellum | Cockerell | 1744 | holotype |
| Megachilidae | Anthidium | angulatum | Cockerell | 1737 | holotype |
| Megachilidae | Anthidium | atripes vandykei | Timberlake | 6644 | holotype |
| Megachilidae | Anthidium | brachyurum | Cockerell | 1738 | holotype |
| Megachilidae | Anthidium | divisum nanulum | Cockerell | 1735 | holotype |
| Megachilidae | Anthidium | divisum ornatifrons | Cockerell | 1734 | holotype |
| Megachilidae | Anthidium | divisum | Cockerell | 1733 | holotype |
| Megachilidae | Anthidium | flavicaudum | Cockerell | 1741 | holotype |
| Megachilidae | Anthidium | fontis | Cockerell | 1731 | holotype |
| Megachilidae | Anthidium | fresnoense | Cockerell | 1729 | holotype |
| Megachilidae | Anthidium | hamatum | Cockerell | 1739 | holotype |
| Megachilidae | Anthidium | lucidum | Cockerell | 1743 | holotype |
| Megachilidae | Anthidium | neglectum | Timberlake | 6645 | holotype |
| Megachilidae | Anthidium | pallidiclypeum | Jaycox | 17282 | holotype |
| Megachilidae | Anthidium | palliventre vanduzeei | Cockerell | 4652 | holotype |
| Megachilidae | Anthidium | permaculatum | Cockerell | 1732 | holotype |
| Megachilidae | Anthidium | plumarium | Cockerell | 1736 | holotype |
| Megachilidae | Anthidium | puncticaudum | Cockerell | 1742 | holotype |
| Megachilidae | Anthidium | sculleni | Schwarz | 12030 | holotype |
| Megachilidae | Anthidium | sonorense productum | Cockerell | 953 | holotype |
| Megachilidae | Anthidium | sonorense | Cockerell | 952 | holotype |
| Megachilidae | Anthidium | spinosum | Cockerell | 1740 | holotype |
| Megachilidae | Anthidium | tenuiflorae austromontana | Timberlake | 6646 | holotype |
| Megachilidae | Anthidium | wallisi wallowana | Schwarz | 12031 | holotype |
| Megachilidae | Anthidium | willinki | Moldenke | 14220 | holotype |
| Megachilidae | Anthidium | xanthognathum | Cockerell | 1730 | holotype |
| Megachilidae | Anthocopa | anthodyta | Michener | 5156 | holotype |
| Megachilidae | Anthocopa | arizonensis | Michener | 6683 | holotype |
| Megachilidae | Anthocopa | hebitis | Michener | 6684 | holotype |
| Megachilidae | Anthocopa | hypostomalis | Michener | 6685 | holotype |
| Megachilidae | Anthocopa | laevibullata | Michener | 5165 | holotype |
| Megachilidae | Anthocopa | mallognatha | Michener | 5162 | holotype |
| Megachilidae | Anthocopa | namatophila | Michener | 14933 | holotype |
| Megachilidae | Anthocopa | nigrior | Michener | 5170 | holotype |
| Megachilidae | Anthocopa | nitidivitta | Michener | 5163 | holotype |
| Megachilidae | Anthocopa | oregona | Michener | 5168 | holotype |
| Megachilidae | Anthocopa | panamintensis | Michener | 5160 | holotype |
| Megachilidae | Anthocopa | pycnognatha solatus | Michener | 14934 | holotype |
| Megachilidae | Anthocopa | pycnognatha | Michener | 5158 | holotype |
| Megachilidae | Anthocopa | triodonta usingeri | Michener | 5166 | holotype |
| Megachilidae | Ashmeadiella | aridula | Cockerell | 15637 | holotype |
| Megachilidae | Ashmeadiella | breviceps | Michener | 4746 | holotype |
| Megachilidae | Ashmeadiella | cactorum astragali | Michener | 4731 | holotype |
| Megachilidae | Ashmeadiella | californica sierraensis | Michener | 4733 | holotype |
| Megachilidae | Ashmeadiella | cazieri | Michener | 4742 | holotype |
| Megachilidae | Ashmeadiella | clypeodentata | Michener | 4164 | holotype |
| Megachilidae | Ashmeadiella | crassa | Cockerell | 1528 | holotype |
| Megachilidae | Ashmeadiella | difugita emarginatula | Michener | 6686 | holotype |
| Megachilidae | Ashmeadiella | difugita | Michener | 14935 | holotype |
| Megachilidae | Ashmeadiella | digiticauda | Cockerell | 1525 | holotype |
| Megachilidae | Ashmeadiella | erema | Michener | 4737 | holotype |
| Megachilidae | Ashmeadiella | eurynorhyncha | Michener | 4735 | holotype |
| Megachilidae | Ashmeadiella | florissantensis | Cockerell | 15638 | holotype |
| Megachilidae | Ashmeadiella | foveata | Michener | 14936 | holotype |
| Megachilidae | Ashmeadiella | foxiella | Michener | 4743 | holotype |
| Megachilidae | Ashmeadiella | gillettei cismontanica | Michener | 14937 | holotype |
| Megachilidae | Ashmeadiella | haematopoda | Cockerell | 1522 | holotype |
| Megachilidae | Ashmeadiella | inyoensis | Michener | 4744 | holotype |
| Megachilidae | Ashmeadiella | leachi | Michener | 6687 | holotype |
| Megachilidae | Ashmeadiella | leucozona | Cockerell | 1524 | holotype |
| Megachilidae | Ashmeadiella | micheneri | Snelling | 6679 | holotype |
| Megachilidae | Ashmeadiella | microsoma | Cockerell | 1523 | holotype |
| Megachilidae | Ashmeadiella | occipitalis | Michener | 4726 | holotype |
| Megachilidae | Ashmeadiella | parkinsoniae | Parker | 13110 | holotype |
| Megachilidae | Ashmeadiella | rhodognatha | Cockerell | 1526 | holotype |
| Megachilidae | Ashmeadiella | rhodopus | Michener | 4165 | holotype |
| Megachilidae | Ashmeadiella | rufitarsis | Michener | 14938 | holotype |
| Megachilidae | Ashmeadiella | rufiventris | Michener | 4728 | holotype |
| Megachilidae | Ashmeadiella | salviae | Michener | 4740 | holotype |
| Megachilidae | Ashmeadiella | sculleni | Michener | 4734 | holotype |
| Megachilidae | Ashmeadiella | sonora | Michener | 4729 | holotype |
| Megachilidae | Ashmeadiella | stenognatha | Michener | 4924 | holotype |
| Megachilidae | Ashmeadiella | subangusta | Cockerell | 1527 | holotype |
| Megachilidae | Ashmeadiella | timberlakei solida | Michener | 4738 | holotype |
| Megachilidae | Ashmeadiella | titusi | Michener | 14939 | holotype |
| Megachilidae | Ashmeadiella | vandykiella | Michener | 6688 | holotype |
| Megachilidae | Ashmeadiella | wislizeni | Cockerell | 15639 | holotype |
| Megachilidae | Ashmeadiella | xenomastax | Michener | 4748 | holotype |
| Megachilidae | Callanthidium | formosum pratense | Cockerell | 1747 | holotype |
| Megachilidae | Chelostoma | bernardinum | Michener | 4493 | holotype |
| Megachilidae | Chelostoma | jacintanum | Cockerell | 15640 | holotype |
| Megachilidae | Chelostoma | minutum cockerelli | Michener | 4494 | holotype |
| Megachilidae | Chelostoma | minutum incisulum | Michener | 4538 | holotype |
| Megachilidae | Chelostoma | minutum marginatum | Michener | 14940 | holotype |
| Megachilidae | Chelostoma | phaceliae | Michener | 4491 | holotype |
| Megachilidae | Chelostoma | tetramerum | Michener | 5216 | holotype |
| Megachilidae | Chelostomoides | pratti | Cockerell | 15641 | syntype |
| Megachilidae | Chelostomopsis | australis nanus | Cockerell | 1666 | holotype |
| Megachilidae | Chelynia | chlorocyanea | Cockerell | 1668 | holotype |
| Megachilidae | Chelynia | fragariella | Cockerell | 1670 | holotype |
| Megachilidae | Chelynia | franciscana | Cockerell | 1667 | holotype |
| Megachilidae | Chelynia | holocyanea | Cockerell | 1671 | holotype |
| Megachilidae | Chelynia | leucotricha | Cockerell | 1669 | holotype |
| Megachilidae | Chelynia | nitidula | Cockerell | 1672 | holotype |
| Megachilidae | Chelynia | subglauca | Cockerell | 1673 | holotype |
| Megachilidae | Coelioxys | asclepiadis | Cockerell | 1636 | holotype |
| Megachilidae | Coelioxys | gonaspis | Cockerell | 1530 | holotype |
| Megachilidae | Coelioxys | hypodonta | Cockerell | 1637 | holotype |
| Megachilidae | Coelioxys | mediata | Cockerell | 1634 | holotype |
| Megachilidae | Coelioxys | rufitarsis claripes | Cockerell | 1633 | holotype |
| Megachilidae | Coelioxys | salinaria | Cockerell | 1635 | holotype |
| Megachilidae | Coelioxys | tiburonensis | Cockerell | 1529 | holotype |
| Megachilidae | Dianthidium | consimile mccrackenae | Timberlake | 5585 | holotype |
| Megachilidae | Dianthidium | desertorum | Timberlake | 14941 | holotype |
| Megachilidae | Dianthidium | discors | Timberlake | 6647 | holotype |
| Megachilidae | Dianthidium | dubium dilectum | Timberlake | 14943 | holotype |
| Megachilidae | Dianthidium | dubium | Schwarz | 14942 | holotype |
| Megachilidae | Dianthidium | fraternum hirtulum | Timberlake | 5579 | holotype |
| Megachilidae | Dianthidium | fraternum | Timberlake | 14944 | holotype |
| Megachilidae | Dianthidium | heterulkei cornucopiana | Schwarz | 9435 | holotype |
| Megachilidae | Dianthidium | heterulkei | Schwarz | 14945 | holotype |
| Megachilidae | Dianthidium | implicatum | Timberlake | 14946 | holotype |
| Megachilidae | Dianthidium | macswaini | Timberlake | 5587 | holotype |
| Megachilidae | Dianthidium | marshi | Grigarick and Schuster | 8960 | holotype |
| Megachilidae | Dianthidium | parkeri | Grigarick and Schuster | 8961 | holotype |
| Megachilidae | Dianthidium | parvum baculifrons | Cockerell | 1746 | holotype |
| Megachilidae | Dianthidium | parvum basingeri | Timberlake | 14947 | holotype |
| Megachilidae | Dianthidium | parvum schwarzi | Timberlake | 14948 | holotype |
| Megachilidae | Dianthidium | parvum swenki | Schwarz | 14949 | syntype |
| Megachilidae | Dianthidium | platyurum mohavense | Timberlake | 14950 | holotype |
| Megachilidae | Dianthidium | platyurum | Cockerell | 950 | holotype |
| Megachilidae | Dianthidium | plenum australe | Timberlake | 14952 | holotype |
| Megachilidae | Dianthidium | plenum williamsi | Timberlake | 14953 | holotype |
| Megachilidae | Dianthidium | plenum | Timberlake | 14951 | holotype |
| Megachilidae | Dianthidium | profugum | Cockerell | 951 | holotype |
| Megachilidae | Dianthidium | pudicum decorum | Timberlake | 5581 | holotype |
| Megachilidae | Dianthidium | pudicum inyoense | Timberlake | 5583 | holotype |
| Megachilidae | Dianthidium | pudicum peninsulare | Timberlake | 6022 | holotype |
| Megachilidae | Dianthidium | rossi | Timberlake | 6023 | holotype |
| Megachilidae | Dianthidium | singulare melanognathum | Cockerell | 1745 | holotype |
| Megachilidae | Dianthidium | subrufulum | Timberlake | 5575 | holotype |
| Megachilidae | Dianthidium | ulkei reductum | Timberlake | 5577 | holotype |
| Megachilidae | Dianthidium | ulkei riparii | Schwarz | 14954 | syntypes, 2 |
| Megachilidae | Dioxys | catalinensis | Cockerell | 15642 | holotype |
| Megachilidae | Dioxys | pacificus melanogaster | Hurd | 6668 | holotype |
| Megachilidae | Dioxys | pacificus | Cockerell | 4669 | holotype |
| Megachilidae | Dioxys | phaceliae | Cockerell | 15643 | holotype |
| Megachilidae | Dioxys | pomonae timberlakei | Hurd | 6669 | holotype |
| Megachilidae | Dioxys | productus cismontanicus | Hurd | 14955 | holotype |
| Megachilidae | Dioxys | rohweri | Cockerell | 4670 | holotype |
| Megachilidae | Heriades | cressoni | Michener | 4600 | holotype |
| Megachilidae | Heriades | micheneri | Timberlake | 14956 | holotype |
| Megachilidae | Heriades | occidentalis | Michener | 4598 | holotype |
| Megachilidae | Heriades | sauteri philippinensis | Cockerell | 15645 | syntypes, 2 |
| Megachilidae | Heriades | sauteri | Cockerell | 15644 | syntype |
| Megachilidae | Heriades | timberlakei | Michener | 14957 | holotype |
| Megachilidae | Heteranthidium | subtimberlakei | Schwarz | 14958 | holotype |
| Megachilidae | Heteranthidium | timberlakei | Schwarz | 14959 | syntypes, 2 |
| Megachilidae | Heterostelis | hurdi | Thorp | 9226 | holotype |
| Megachilidae | Heterostelis | texana | Thorp | 9227 | holotype |
| Megachilidae | Hoplitis | hicksi | Cockerell | 15646 | holotype |
| Megachilidae | Hoplitis | mojavensis | Michener | 14961 | holotype |
| Megachilidae | Hoplitis | perissocera | Michener | 6691 | holotype |
| Megachilidae | Hoplitis | producta bernardina | Michener | 14962 | holotype |
| Megachilidae | Hoplitis | rufina | Michener | 6692 | holotype |
| Megachilidae | Lithurgus | arizonensis | Cockerell | 4664 | holotype |
| Megachilidae | Lithurgus | oblongus | Fox | 278 | syntype |
| Megachilidae | Lithurgus | oblongus | Fox | 279 | syntype |
| Megachilidae | Lithurgus | socorroensis | Mitchell | 4602 | holotype |
| Megachilidae | Megachile | adelphodonta | Cockerell | 1513 | holotype |
| Megachilidae | Megachile | adesmiae | Moldenke | 14223 | holotype |
| Megachilidae | Megachile | andalgalensis | Moldenke | 14224 | holotype |
| Megachilidae | Megachile | anograe | Cockerell | 15647 | syntype |
| Megachilidae | Megachile | arnaudi | Moldenke | 14225 | holotype |
| Megachilidae | Megachile | asterae | Mitchell | 5233 | holotype |
| Megachilidae | Megachile | astragali | Mitchell | 14207 | holotype |
| Megachilidae | Megachile | austrargentina | Moldenke | 14226 | holotype |
| Megachilidae | Megachile | balastensis | Moldenke | 14227 | holotype |
| Megachilidae | Megachile | belenensis | Moldenke | 14228 | holotype |
| Megachilidae | Megachile | bishoppi | Cockerell | 15648 | syntype |
| Megachilidae | Megachile | blaisdelli | Mitchell | 3617 | holotype |
| Megachilidae | Megachile | boharti | Mitchell | 5231 | holotype |
| Megachilidae | Megachile | brachysoma | Cockerell | 1519 | holotype |
| Megachilidae | Megachile | cachiensis | Moldenke | 14229 | holotype |
| Megachilidae | Megachile | capillitensis | Moldenke | 14230 | holotype |
| Megachilidae | Megachile | chilopsidis | Cockerell | 15649 | syntype |
| Megachilidae | Megachile | chorillensis | Moldenke | 14231 | holotype |
| Megachilidae | Megachile | cleomis lippiae | Cockerell | 15650 | syntype |
| Megachilidae | Megachile | deuterochoniae | Moldenke | 14232 | holotype |
| Megachilidae | Megachile | discorhina | Cockerell | 1514 | holotype |
| Megachilidae | Megachile | disparipennis | Cockerell in W. P. Cockerell | 15651 | syntype |
| Megachilidae | Megachile | estebana | Cockerell | 1520 | holotype |
| Megachilidae | Megachile | frugalis pseudofrugalis | Mitchell | 3620 | holotype |
| Megachilidae | Megachile | infernillensis | Moldenke | 14233 | holotype |
| Megachilidae | Megachile | inyoensis | Mitchell | 5232 | holotype |
| Megachilidae | Megachile | justiciae | Moldenke | 14234 | holotype |
| Megachilidae | Megachile | leucographoides | Moldenke | 14235 | holotype |
| Megachilidae | Megachile | lobatifrons | Cockerell | 1512 | holotype |
| Megachilidae | Megachile | melanderi | Mitchell | 14208 | holotype |
| Megachilidae | Megachile | melanophaea submelanophaea | Mitchell | 3615 | holotype |
| Megachilidae | Megachile | mojavensis | Mitchell | 3618 | holotype |
| Megachilidae | Megachile | neffi | Moldenke | 14236 | holotype |
| Megachilidae | Megachile | nigrargentina | Moldenke | 14237 | holotype |
| Megachilidae | Megachile | nigrinquirenda | Moldenke | 14238 | holotype |
| Megachilidae | Megachile | nigroludens | Moldenke | 14239 | holotype |
| Megachilidae | Megachile | occidentalis leucotricha | Cockerell | 15652 | syntype |
| Megachilidae | Megachile | occidentalis | Fox | 280 | syntype |
| Megachilidae | Megachile | odontostoma | Cockerell | 1515 | holotype |
| Megachilidae | Megachile | onobrychidis | Cockerell | 15653 | holotype |
| Megachilidae | Megachile | opuntiarum | Cockerell | 15654 | holotype |
| Megachilidae | Megachile | palmensis | Mitchell | 3616 | holotype |
| Megachilidae | Megachile | pastizalensis | Moldenke | 14240 | holotype |
| Megachilidae | Megachile | patlincolni | Moldenke | 14241 | holotype |
| Megachilidae | Megachile | populi | Cockerell | 15655 | syntype |
| Megachilidae | Megachile | prosopidis testudinis | Cockerell | 1544 | holotype |
| Megachilidae | Megachile | puertolobensis | Moldenke | 14242 | holotype |
| Megachilidae | Megachile | raveni | Moldenke | 14243 | holotype |
| Megachilidae | Megachile | remotissima | Cockerell | 2392 | holotype |
| Megachilidae | Megachile | rossi | Mitchell | 5234 | holotype |
| Megachilidae | Megachile | rubripennis | Moldenke | 14244 | holotype |
| Megachilidae | Megachile | santiamensis | Mitchell | 6656 | holotype |
| Megachilidae | Megachile | seducta | Mitchell | 3619 | holotype |
| Megachilidae | Megachile | semiexilis | Cockerell | 15656 | syntype |
| Megachilidae | Megachile | sidalceae | Cockerell | 15657 | syntype |
| Megachilidae | Megachile | slevini | Cockerell | 1516 | holotype |
| Megachilidae | Megachile | soledadensis | Cockerell | 15658 | syntype |
| Megachilidae | Megachile | sonorana | Cockerell | 1518 | holotype |
| Megachilidae | Megachile | subfortis | Mitchell | 14963 | holotype |
| Megachilidae | Megachile | subparallela | Mitchell | 14210 | holotype |
| Megachilidae | Megachile | tiburonensis | Cockerell | 1521 | holotype |
| Megachilidae | Megachile | tilcarensis | Moldenke | 14245 | holotype |
| Megachilidae | Megachile | townsendiana | Cockerell | 15659 | syntype |
| Megachilidae | Megachile | valdizensis | Moldenke | 14246 | holotype |
| Megachilidae | Megachile | vanduzeei | Cockerell | 1517 | holotype |
| Megachilidae | Megachile | vandykei | Cockerell | 1665 | holotype |
| Megachilidae | Megachile | verbesinae | Cockerell | 15660 | holotype |
| Megachilidae | Megachile | yumensis | Mitchell | 14209 | holotype |
| Megachilidae | Osmia | abdominalis | Michener | 4366 | holotype |
| Megachilidae | Osmia | albolateralis | Cockerell | 15661 | holotype |
| Megachilidae | Osmia | albomarginata | Cockerell | 14964 | holotype |
| Megachilidae | Osmia | alta | Michener | 4511 | syntype |
| Megachilidae | Osmia | angustipes | Cockerell | 15662 | holotype |
| Megachilidae | Osmia | aprilina | Cockerell | 15663 | syntype |
| Megachilidae | Osmia | arefacta | Cockerell | 14965 | holotype |
| Megachilidae | Osmia | caulicola | Cockerell | 4666 | holotype |
| Megachilidae | Osmia | celsa | Sandhouse | 1562 | holotype |
| Megachilidae | Osmia | coloradella | Cockerell | 15664 | holotype |
| Megachilidae | Osmia | copelandica | Cockerell | 15665 | holotype |
| Megachilidae | Osmia | cyanopoda | Cockerell | 15666 | holotype |
| Megachilidae | Osmia | enceliae | Cockerell | 14966 | syntype |
| Megachilidae | Osmia | enixa | Sandhouse | 1553 | holotype |
| Megachilidae | Osmia | erythrotricha | Cockerell | 15667 | holotype |
| Megachilidae | Osmia | exilis | Sandhouse | 1559 | holotype |
| Megachilidae | Osmia | femorata | Michener | 8756 | holotype |
| Megachilidae | Osmia | francisconis | White | 6694 | holotype |
| Megachilidae | Osmia | gabrielis | Cockerell | 15668 | holotype |
| Megachilidae | Osmia | giffardi | Sandhouse | 15788 | holotype |
| Megachilidae | Osmia | globosiformis | Cockerell | 15669 | holotype |
| Megachilidae | Osmia | gracilis | Michener | 4365 | holotype |
| Megachilidae | Osmia | hemizoniae | Cockerell | 14967 | holotype |
| Megachilidae | Osmia | hesperella | Cockerell | 15670 | syntype |
| Megachilidae | Osmia | hypochrysea rohweri | Cockerell | 15672 | holotype |
| Megachilidae | Osmia | hypochrysea | Cockerell | 15671 | holotype |
| Megachilidae | Osmia | hypocrita | Cockerell | 15673 | holotype |
| Megachilidae | Osmia | kerminesina | Sandhouse | 1556 | holotype |
| Megachilidae | Osmia | laeta | Sandhouse | 1557 | holotype |
| Megachilidae | Osmia | latisulcata | Michener | 8758 | holotype |
| Megachilidae | Osmia | liogastra | Cockerell | 15674 | holotype |
| Megachilidae | Osmia | lyncis | Cockerell | 4665 | holotype |
| Megachilidae | Osmia | marginata | Michener | 8759 | holotype |
| Megachilidae | Osmia | melanotricha | Lovell and Cockerell | 15675 | syntype |
| Megachilidae | Osmia | mixta | Michener | 8760 | holotype |
| Megachilidae | Osmia | nelsoni | Cockerell | 4671 | holotype |
| Megachilidae | Osmia | nemoris | Sandhouse | 1551 | holotype |
| Megachilidae | Osmia | occidentalis | Michener | 8761 | holotype? |
| Megachilidae | Osmia | palmarum | Cockerell | 14968 | holotype |
| Megachilidae | Osmia | paradisica | Sandhouse | 1549 | holotype |
| Megachilidae | Osmia | pellax | Sandhouse | 1565 | holotype |
| Megachilidae | Osmia | pentstemonis | Cockerell | 15676 | syntype |
| Megachilidae | Osmia | peridonea | Sandhouse | 1554 | holotype |
| Megachilidae | Osmia | phaceliarum | Cockerell | 14969 | holotype |
| Megachilidae | Osmia | pingreeana | Michener | 8762 | holotype |
| Megachilidae | Osmia | potentillae | Michener | 8763 | holotype |
| Megachilidae | Osmia | proposita | Sandhouse | 1563 | holotype |
| Megachilidae | Osmia | punctata | Michener | 8764 | holotype |
| Megachilidae | Osmia | robustula | Cockerell | 14970 | holotype |
| Megachilidae | Osmia | rostrata | Sandhouse | 1558 | holotype |
| Megachilidae | Osmia | rupestris | Cockerell | 14971 | holotype |
| Megachilidae | Osmia | seclusa | Sandhouse | 1560 | holotype |
| Megachilidae | Osmia | sedula | Sandhouse | 1561 | holotype |
| Megachilidae | Osmia | sequoiae | Michener | 8765 | holotype |
| Megachilidae | Osmia | shastensis | Cockerell | 14972 | holotype |
| Megachilidae | Osmia | solitaria | Sandhouse | 1552 | holotype |
| Megachilidae | Osmia | theta | Sandhouse | 4662 | holotype |
| Megachilidae | Osmia | timberlakei | Cockerell | 14973 | holotype |
| Megachilidae | Osmia | tokopahensis | Michener | 8766 | holotype |
| Megachilidae | Osmia | triodonta | Cockerell | 14974 | holotype |
| Megachilidae | Osmia | vana | Sandhouse | 1555 | holotype |
| Megachilidae | Osmia | vanduzeei | Sandhouse | 1548 | holotype |
| Megachilidae | Osmia | vandykei | Sandhouse | 1550 | holotype |
| Megachilidae | Osmia | viguierae mortua | Cockerell | 14976 | holotype |
| Megachilidae | Osmia | viguierae | Cockerell | 14975 | holotype |
| Megachilidae | Osmia | visenda | Sandhouse | 1564 | holotype |
| Megachilidae | Osmia | wardiana austromontana | Michener | 8767 | holotype ? |
| Megachilidae | Osmia | wheeleri | Cockerell | 15677 | holotype |
| Megachilidae | Osmia | xerophila | Cockerell | 14977 | holotype |
| Megachilidae | Paranthidium | sonorum | Michener | 6682 | holotype |
| Megachilidae | Proteriades | basingeri | Timberlake and Michener | 14978 | holotype |
| Megachilidae | Proteriades | boharti | Timberlake and Michener | 6689 | holotype |
| Megachilidae | Proteriades | cryptanthae | Timberlake and Michener | 14979 | holotype |
| Megachilidae | Proteriades | deserticola | Timberlake and Michener | 14980 | holotype |
| Megachilidae | Proteriades | emarginatus | Griswold | 14151 | holotype |
| Megachilidae | Proteriades | evansi | Michener | 8768 | holotype |
| Megachilidae | Proteriades | incanescens nevadensis | Timberlake and Michener | 6722 | holotype |
| Megachilidae | Proteriades | nanula | Timberlake and Michener | 14981 | holotype |
| Megachilidae | Proteriades | nigra | Timberlake and Michener | 14982 | holotype |
| Megachilidae | Proteriades | nigrella | Michener | 14983 | holotype |
| Megachilidae | Proteriades | pygmaea | Timberlake and Michener | 14984 | holotype |
| Megachilidae | Proteriades | reducta | Timberlake and Michener | 14985 | holotype |
| Megachilidae | Proteriades | seminigra yosemitensis | Timberlake and Michener | 6690 | holotype |
| Megachilidae | Proteriades | seminigra | Timberlake and Michener | 14986 | holotype |
| Megachilidae | Proteriades | similis | Timberlake and Michener | 14987 | holotype |
| Megachilidae | Proteriades | tristis | Michener | 8769 | holotype |
| Megachilidae | Pycnanthidium | solomonis | Krombein | 6672 | holotype |
| Megachilidae | Raphidostoma | ceanothi | Cockerell | 4256 | holotype |
| Megachilidae | Robertsonella | crataegina | Cockerell | 15678 | syntype |
| Megachilidae | Robertsonella | dolichosoma | Cockerell | 15679 | holotype |
| Megachilidae | Rozenia | jerryi | Moldenke | 14247 | holotype |
| Megachilidae | Stelis | acutiventris | Linsley | 6693 | holotype |
| Megachilidae | Stelis | anthidioides | Timberlake | 15936 | holotype |
| Megachilidae | Stelis | anthracina | Timberlake | 15937 | holotype |
| Megachilidae | Stelis | ashmeadiellae | Timberlake | 15938 | holotype |
| Megachilidae | Stelis | callura | Cockerell | 1674 | holotype |
| Megachilidae | Stelis | depressa | Timberlake | 15939 | holotype |
| Megachilidae | Stelis | fremonti | Cockerell | 1675 | holotype |
| Megachilidae | Stelis | hemirhoda | Linsley | 4810 | holotype |
| Megachilidae | Stelis | linsleyi | Timberlake | 5771 | holotype |
| Megachilidae | Stelis | micheneri | Linsley | 8773 | holotype |
| Megachilidae | Stelis | nigriventris | Timberlake | 15940 | holotype |
| Megachilidae | Stelis | palmarum | Timberlake | 15941 | holotype |
| Megachilidae | Stelis | robertsoni | Timberlake | 15942 | holotype |
| Megachilidae | Stelis | semirubra reducta | Snelling | 6678 | holotype |
| Megachilidae | Stelis | semirubra | Timberlake | 15943 | holotype |
| Megachilidae | Stelis | seneciophila | Cockerell | 15944 | holotype |
| Megachilidae | Stelis | trichopyga | Timberlake | 15945 | holotype |
| Megachilidae | Titusella | clypeata | Michener | 15885 | holotype |
| Megachilidae | Trachusa | catinula | Brooks and Griswold | 16665 | holotype |
| Megachilidae | Trachusa | gummifera | Thorp | 6766 | holotype |
| Megachilidae | Trichothurgus | piedrabuenae | Moldenke | 14250 | holotype |