CRATOGEOMYS. 315 



reaching the plane of the orbit; cranium broad posteriorly, the 

 squamosals expanding laterally ; audital bullae short ; a single broad 

 groove on upper incisor. 



Color. Above mixed dusky and whitish; throat and sides of 

 face darker; under parts paler; hind feet whitish; fore feet similar 

 to but darker than upper parts; tail dusky. 



Measurements. Total length, 304; tail vertebrae, 87; hind foot, 

 42. Skull: basal length, 52; Hensel, 47.5; zygomatic width, 35; inter- 

 orbital width, 7.5; length of upper molar series, 11.5; length of single 

 half of mandible, 37. 



FIG. XLVI. CRATOGEOMYS CASTANOPS. 

 CHESTNUT-FACED POCKET GOPHER. 



313. castanops (Pseudostomd), Baird, Rep. Stansb. Exped. to Great 

 Salt Lake, 1852, p. 313. 



clarkii, Baird, Proc. Acad. Nat. Scien. Phil., 1855, p. 332. 



castanops (Cratogcomys), Elliot, Syn. N. Am. Mamm., 1901, p. 220. 

 CHESTNUT-FACED POCKET GOPHER. 



Type locality. Prairie Road to Bent's Fort, near the present 

 town of Las Animas, Bent County, Colorado, on the Arkansas River. 



Geogr. Distr. States of Chihuahua and Coahuila, Mexico, north 

 to Colorado. 



Genl. Char. Size medium; tail medium. Skull broad, heavy; basi- 

 occipital rectangular; sides parallel; rostrum and braincase long; 

 superior profile convex; end of maxillary root of zygoma greatly 

 expanded, forming a plate. 



Color. Above yellowish brown mixed with black; beneath buffy, 

 plumbeous base of hairs visible; fore feet black; hind feet blackish 

 brown; tail hairs blackish. 



Measurements. Total length, 295; tail vertebrae, 77; hind foot, 

 33. Another specimen from Paladura Canon, Texas, measured in 

 total length, 280; tail vertebrae, 80; hind foot, 39, taken in the flesh. 

 Skull: basal length, 47.5-56.5; Hensel, 40.5-49; zygomatic width, 



