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 vertebre, 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. 
Fic. XLVI. CRATOGEOMYS CASTANOPS. 
CHESTNUT-FACED POCKET GOPHER. 
313. castanops (Pseudostoma), Baird, Rep. Stansb. Exped. to Great. 
Salt Lake, 1852, p. 313. 
clarki1, Baird, Proc. Acad. Nat. Scien. Phil., 1855, p. 332. 
castanops (Cratogeomys), Elliot, Syn. N. Am. Mamm., 1go1, 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 vertebre, 77; hind foot, 
33. Another specimen from Paladura Cafion, Texas, measured in 
total length, 280; tail vertebra, 80; hind foot, 39, taken in the flesh. 
Skull: basal length, 47.5-56.5; Hensel, 40.5-49; zygomatic width, 
