Order Rodentia - Family Sciuridae Author Robert S. Hoffmann Author Charles G. Anderson text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 419 465 book chapter http://doi.org/10.5281/zenodo.7353130 1-56098-217-9 7353130 Cynomys ludovicianus (Ord, 1815) . In Guthrie, New Geogr., Hist. Coml. Grammar, Philadelphia, 2nd ed., 2:292 . TYPE LOCALITY: "vicinity of the Missouri ." Restricted by Hollister (1916a:14) to "Upper Missouri River ." DISTRIBUTION: Saskatchewan ( Canada ); Montana to E Nebraska , W Texas , New Mexico , and SE Arizona ( USA ); NE Sonora , and N Chihuahua ( Mexico ). SYNONYMS: arizonensis Mearns, 1890 ; cinereus Richardson, 1829 ; grisea Rafinesque, 1817; latrans (Harlan, 1815); missouriensis (Warden, 1819); pyrrotrichus Elliot, 1905 ; socialis Rafinesque, 1817 . COMMENTS: Subgenus Cynomys . Intraspecific variation reviewed by Chesser (1983) .