Vol. XIV. pp. 107-117 July 19, 1901 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



■■i> \ ''■ 



DESCRIPTIONS OF TWKNTY-THREK NEW POCKET 

 GOPHERS OF THE GENUS THOMOMYS. 



HY r. HART MERRIAM. 



The Mammal Collectit)ii of tlu' U. S. Biological Survey still 

 contains a number of apparently nameless species of Pocket 

 Gophers of the o-enus 71tO)n<)»ii/x. Most of these are here de- 

 scribed. In makinu' the necessary comparisons with other 

 members of the genus I have been greatly assisted by A'ernon 

 Bailey. 



Thomomys latirostr.'s sp. nov. 



2'ype from LilMc ('oloraclo River, Painted Desert, Ai'izona. Xo. l^xyH 

 $ ad., U. S. National Muscnim, Hioloiiical Sur\e\ Collection. Septem- 

 ber 22. 1899. C. Ilart ]\lerriam and Vernon Bailey. Ori-iinal Xo. .■)()4. 



Churacti rs. ~9^\yM medium: coloration very pale ;i(.)lden fiilvons: roti- 

 Innit /<lri/,'ii/>//(/ IhukhI. 



Color. — I'pperparls imirorni pale (iclirac(M)ns hnlf williout appreciable 

 admixliu-e of black tijipeil hairs: underpai'ls, leel, and tail whitisli. 



Cntni/il chtirdrtcrK.- Skull uni(pie: heavy, massive and angular but 

 not ridj^'ed; ri/.i/rmn /jfoud/i/ I'.vjxi inlrd uml lirixidcxl <it biisr, the g'reat 

 breadth beiny in the premaxilhe: nasals cdnslricled in middle, slijj-htly 

 notched behiml, and falling far short of prema.\illa': zy<;-omata moder- 

 ately spreading, angular, their outer sides ijarallel; buUie medium, 

 smaller than in aureus; interparietal broadly pentagcmal. 



Measurements. — Type .specimen {$ ad.): total length 2;^2: tail verte- 

 brate 79: hind foot 33. 



19— BIOL. Soc. Wash. Vol. XIV. 1901. (107) 



