| Reithrodontomys tenuirostris subsp. aureus Merriam, 1901 |
| Reithrodontomys wagneri Hooper, 1950 |
| Reithrodontomys wagneri subsp. bakeri Bradley, Mendez-Harclerode, Hamilton & Ceballos, 2004 |
| Reithrodontomys zacatecae Merriam, 1901 |
| Rheomys Thomas, 1906 |
| Rheomys mexicanus Goodwin, 1959 |
| Rheomys thomasi Dickey, 1928 |
| Rheomys thomasi subsp. chiapensis Hooper, 1947 |
| Scotinomys Thomas, 1913 |
| Scotinomys teguina (Alston, 1877) |
| Scotinomys teguina subsp. subnubilus Goldman, 1935 |
| Scotinomys teguina subsp. teguina (Alston, 1877) |
| Sigmodon Say & Ord, 1825 |
| Sigmodon alleni Bailey, 1902 |
| Sigmodon alleni subsp. alleni Bailey, 1902 |
| Sigmodon alleni subsp. planifrons E. W. Nelson & Goldman, 1933 |
| Sigmodon alleni subsp. vulcani J. A. Allen, 1906 |
| Sigmodon alticola Bailey, 1902 |
| Sigmodon alticola subsp. alticola Bailey, 1902 |
| Sigmodon alticola subsp. amoles Bailey, 1902 |