CYNOMYS. 



155 



Gcnl. Char. Size large; tail nearly twice as long as that of C. 

 gnnuisoui. 



Color. Summer Pelage. Above vinaceous cinnamon ; below whit- 

 ish; tail with a narrow subterminal bar of broccoli brown. 



Winter Pelage. Above pale sandy buff; below white tinged with 

 buff. 



Measurements. Total length, 376; tail vertebrae, 84; hind 

 foot, 61. Skull: basilar length, 54.3; total length, 66; interorbital 

 width, 14; length of nasals, 25; zygomatic width, 43.5; length of 

 upper molar series, 16.3. 



FIG. XXXII. CYNOMYS LUDOVICIANUS. PRAIRIE-DOG. 



115. ludovicianus (Arctomys), Ord, Guth., Geog., n, 1815, 2d Am. 

 ed., p. 292. 



socialis Rafin., Am. Month. Mag., n, 1817, p. 45. 



grisea Rafin. , Am. Month. Mag., n, 1817, p. 45. 



missouriensis Warden, Descrip. Etats Unis, v, 1820, p. 627. 



latrans Harlan, Faun. Am., 1825, p. 306. 



ludoricianus (Cynomys) Elliot, Syn. N. Am. Mamm., 1901, p. 102. 

 PRAIRIE-DOG, Perrito, Perrito del Campo, in Mexico. 



Type locality. Plains of the Upper Missouri. 



Geogr. Distr. State of Chihuahua, Mexico, north into western 

 Texas and Kansas to 49th parallel. 



Gcnl. Char. Body stout; tail short; ears very small; claws long. 



