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, FROM OREGON, 



CALIFORNIA, AND NEVADA. 



BY C. HART MERRIAM. 



Owing to unavoidable delay in the publication of my revision 

 of the Pocket Gophers of the genus Tliomomya, it is thought 

 best to publish the following new species at once : 



Thomomys nevadensis sp. nov. 



Tape from Austin, Nevada. No. H^l, c? yg- ad. U. S. Nat. Mus., 

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

 Original No. 2097. 



General characters. Size large largest of the genus after T. bulbivorus. 

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

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

 length. 



Color. Normal pelage : upper parts buff, pinkish buff, or buffy gray, 

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

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

 hind feet and tail whitish ; ears and small post-auricular spot dusky. 

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

 patch on throat and inner side of cheek pouches ; fore and hind feet and 

 terminal part of tail (irregularly) white or whitish. 



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

 bulbivorus, 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 ; premaxillse pushing far back behind nasals ; 

 pterygoids normal (not expanded and inflated as in bulbivorus) ; incisors 

 projecting forward, but not so far as in bulbivorus. 



Measurements. Type specimen: total length, 275; tail vertebrae, 90; 

 hind foot, 38. 



48 BIOL. Soc. WASH., VOL. XI, 1897 (213) 



