| Hodomys alleni subsp. vetulus Merriam, 1894 |
| Hodomys vetulus Merriam, 1894 |
| Holochilus Brandt, 1835 |
| Hypudaeus Illiger, 1811 |
| Hypudaeus leucogaster Wied, 1841 |
| Megadontomys Merriam, 1898 |
| Megadontomys cryophilus (Musser, 1964) |
| Megadontomys nelsoni (Merriam, 1898) |
| Megadontomys thomasi (Merriam, 1898) |
| Megadontomys thomasi subsp. cryophilus (Musser, 1964) |
| Megadontomys thomasi subsp. nelsoni (Merriam, 1898) |
| Megadontomys thomasi subsp. thomasi (Merriam, 1898) |
| Microtus Schrank, 1798 |
| Microtus californicus (Peale, 1848) |
| Microtus californicus subsp. aequivocatus Osgood, 1928 |
| Microtus californicus subsp. grinnelli Huey, 1931 |
| Microtus californicus subsp. huperuthrus Elliot, 1903 |
| Microtus californicus subsp. hyperythrus Elliot, 1903 |
| Microtus californicus subsp. perplexabilis Grinnell, 1926 |
| Microtus drummondii (Audubon & Bachman, 1854) |