NATURAL SCIENCES OF PHILADELPHIA. 133 



Geomys castanops (Baird), LeC. 



Psendostoma castanops, Bd., Stansbury'sRep. G. S. L. 1852, 313. Aud. 



& Bach., Q. N. A. iii. 1854, 304. 

 Geomys castanops, Bd., these Proceedings, 1852, 163 ; Baird, M. N. A. 



1857, 381 ; P. R. R. Rep. x. 1859, Gunnison & Beckwith's Route, 



mammals, 8, pi. 10, f. 2. 

 Geomys clarkii, Baird, these Proceedings, 1855, 332 ; M. N. A. 1857, 



383, pi. 50, figs. a-g. 

 Chestnut-faced and Pecos Gopher, Baird, 11. cc. 



Diag. Superior incisors with a single median groove exactly 

 bisecting the face of the tooth. Forefeet shorter or not longer 

 than the hinder. Color pale yellowish-brown above, inclining 

 more or less to dull chestnut anteriorly, whitish below; size of 

 G. bursarius, or rather less. Fur soft, as usual in the genus. 



Hab. Texas and New Mexico. 



4. Geomys mexicanus (Licht.), LeC. 



Asco my s mexicanus, Licht., Abh. Acad. Wiss. Berl. 1827, 113. 



Saccophorus mexicanus, Fisch., Syn. 1829, 305. 



Geomys mexicanus, Le C., these Proceedings, 1852, 160. Baird, M. N. 



A. 1857, 387. 

 Pseudostoma {Geomys) mexicana, Aud. & Bach., Q. N. A. iii. 1854, 309. 

 Geomys {Saccophorus) mexicanus, Gieb., Siiug. 1855, 529. 

 ? Tucan of Hernandez. Tuc/i or Tuza, Mexican. 



Diag. Superior incisors bisected by a single median groove (as 

 in castanops, which is very different in color). Coloration and 

 general appearance of G. bursarius (which has bisulcate incisors). 

 Fur soft and sleek (as in other species of the genus excepting G. 

 hispidus). Averaging much larger than either of the United 

 States species (about equalling G. hispidus), with proportionally 

 smaller pouches and hands, and weaker claws. Tail and feet 

 hairy (as is usual in the genus, not as in G.tuza or G. hispidus). 



Hab. Mexico. (Limits of its distribution not known.) 



5. Geomys hispidus, Le C. 



Geomys hispidus, Le C, these Proceedings, 1852, 158. Baird, M. N. A. 



1857, 386, pi. 22, f. 4 a-d. 

 Pseudostoma {Geomys) hispidus, Aud. & Bach., Q. N. A. iii. 1854, 



306. 

 Saccophorus quachil, 1 Gray, P. Z. S. xi. 1843, 79 (Cohan, Centr. Am. ; 



descr. nulla.). Gerr., Cat. Bones Br. Mus. 1862, 223. 



1 I do not find that this species, named in 1843, was ever described. 

 Desiring to find out what it was, I wrote to Mr. R. B. Sharpe of the British 



