Order Rodentia - Family Sciuridae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 754 818 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Cynomys (Cynomys) ludovicianus subsp. ludovicianus Ord 1815 Cynomys (Cynomys) ludovicianus subsp. ludovicianus Ord 1815 , in: Guthrie, New Geogr., Hist., Coml. Grammar, Philadelphia , 2nd ed., Vol. 2: 292 . Type Locality: "vicinity of the Missouri ." Restricted by Hollister (1916 a :14) to "Upper Missouri River" ( USA ) . Synonyms: Cynomys (Cynomys) ludovicianus subsp. cinereus Richardson 1829 ; Cynomys (Cynomys) ludovicianus subsp. grisea Rafinesque 1817 ; Cynomys (Cynomys) ludovicianus subsp. latrans (Harlan 1825) ; Cynomys (Cynomys) ludovicianus subsp. missouriensis (Warden 1819) ; Cynomys (Cynomys) ludovicianus subsp. pyrrotrichus Elliot 1905 ; Cynomys (Cynomys) ludovicianus subsp. socialis Rafinesque 1817 .