Vol. XI, pp. 213-216 July 15, 1897 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF EIGHT NEW POCKET GOPHERS 



OF THE GENUS THOMOMYS, FRO^NI OREGON, 



CALIFORNIA, AND NEVADA. 



BY C. HART ME URIAH. 



Owing to unavoidable dela}' in the publication of my revision 

 of the Pocket Gophers of the genus Thomomys, it is thouglit 

 best to publisli the following new species at once : 



Thomomys nevadensis sp. nov. 



rv^>?from Austin, Nevada. No. UTil, d" YS- ad. U. S. Nat. Mus., 

 Biological Survev Coll. Collected Nov. 11, 1890, by Vernon Bailey. 

 Original No. 2007. 



General dmrnclers. — Size large —largest of the genus after T. hnUnrorus. 

 Two color phases: pale buff and dark plumbeous slate. Skull suggesting 

 that of T. biilhirorus ; incisors curving far forward, tail of medium 

 length. 



Color. — Nornud ))ela<je : upper parts buff, pinkish l)utf, or bufly graj', 

 becoming darker (sometimes dusky) on nose and around mouth ; under 

 parts whitish butfy, the plumbeous under fur showing through ; fore and 

 hind feet and tail whitish ; ears and small post-auricular si)Ot dusk}'. 

 ritimbeous pelage: uniform slate color above and below, with irregular white 

 patch on tln-oat and inner side of cheek pouches ; fore and hind feet and 

 terminal i)art of tail (irregularly) white or whitish. 



Vranial characters. — Skull large and heavy, only exceeded by that of T. 

 hidbiroriis, which it resembles in general characters except in the pecu- 

 liar form of the pterygoids ; zygomata widely spreading ; squarely angu- 

 lar, the jugals essentially parallel ; temporal ridges meeting in a low 

 sagittal crest in old males ; premaxilhe pushing far back behind nasals ; 

 pterygoids normal (not expanded and inflated as in halbirorn.s) ; incisors 

 projecting forwanl, but not so far as in hulhivorus. 



Measnremenla. — Type specimen: total length, 275; tail vertebra?, 90; 

 hind foot, 38. 



4S— Biol. Soc. W.\sh.. Vol. XI, 18!t7 (213) 



