| Morganella cueroensis (Cockerell, 1899) |
| Morganella longispina (Morgan, 1889) |
| Mycetaspis Cockerell, 1897 |
| Mycetaspis apicata (Newstead, 1920) |
| Mycetaspis defectopalus Ferris, 1941 |
| Mycetaspis personata (Comstock, 1883) |
| Mycetaspis sphaerioides (Cockerell, 1895) |
| Mytilaspis Targioni-Tozzetti, 1868 |
| Mytilaspis mexicana Cockerell |
| Nicholiella Ferris, 1941 |
| Nicholiella digitata Ferris, 1943 |
| Niveaspis MacGillivray, 1921 |
| Niveaspis argentata (Cockerell, 1898) |
| Niveaspis cattleyae Lepage, 1942 |
| Niveaspis fenestrata Ferris, 1941 |
| Niveaspis townsendiana (Cockerell, 1903) |
| Nuculaspis Ferris, 1938 |
| Nuculaspis apacheca Ferris |
| Nuculaspis californica (Coleman) |
| Odonaspis Leonardi, 1897 |