Sciuridae Hemprich, 1820
Cynomys gunnisoni (Baird, 1855)
Cynomys hibbardi
Cynomys leucurus Merriam, 1890
Cynomys ludovicianus (Ord, 1815)
Cynomys mexicanus Merriam, 1892
Cynomys niobrarius
Cynomys parvidens J. A. Allen, 1905
Cynomys sappaensis
Cynomys spenceri
Cynomys vetus
