| Family | genus | species | author | Type Number | Category |
| Melittidae | Hesperapis | arida | Michener | 4718 | holotype |
| Melittidae | Hesperapis | leucura | Cockerell | 1511 | holotype |
| Melittidae | Hesperapis | macrocephala | Cockerell | 1510 | holotype |
| Melittidae | Hesperapis | nitidulus | Cockerell | 15681 | holotype |
| Melittidae | Hesperapis | pellucidus | Cockerell | 1658 | holotype |
| Melittidae | Hesperapis | semirudis | Cockerell | 15682 | holotype |
| Melittidae | Hesperapis | wilmattae | Cockerell | 15683 | holotype |
| Melittidae | Meganomia | rossi | Michener | 13733 | holotype |
| Melittidae | Melitta | californica | Viereck | 4438 | holotype |
| Melittidae | Panurgus | rhodoceratus | Cockerell | 15684 | syntypes, 2 |