381 



U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



Detailed measurements. 



List of specimens. 



GEOMYS CASTANOPS. 



Chestnut-faced Gopher. 



Pteudottoma casianops, BAIED, in Rep. Stansbury's Exped. G. S. Lake, June, 1852, 313. (Bent's Fort.) 



ADD. and BACH. N. Am. Quad. Ill, 1854, 304. 

 Geomys ccutanops, LBCONTE, Pr. A, N. Sc. Phil. VI, Sept. , 1852, 163. 



SP. CH. Upper incisor with a single deep groove bisecting the surface, the portions on either side similar. Fore feet 

 shorter than the hinder. Second claw extending as far as the fourth. Cheek pouches small. Color, pale brownish yellow; 

 the fore part of head and sides of neck yellowish chestnut, sharply defined. Pouches whitish. 



This species in general appearance resembles the G. clarkii, from western Texas. The upper 

 incisors are furrowed exactly down the central line by a rather deep broad groove, rounded off 

 at the sides as well as the bottom, separating portions; on either side, which are almost per- 



