VOL. XIV, PP. 107-117 JULY 19, 1901 



PROCEEDINGS 



OF THB 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF TWENTY-THREE NEW POCKET 

 GOPHERS OF THE GENUS THOMOMYS. 



BY C. HART MERRIAM. 



The Mammal Collection of the IT. S. Biological Survey still 

 contains a number of apparently nameless species of Pocket 

 Gophers of the genus Thomtntnj*. Most of these are here de 

 scribed. In making the necessary comparisons with other 

 members of the genus I have been greatly assisted by Vernon 

 Bailey. 



Thomomys Iatirostr!s sp. nov. 



Type from Little Colorado River. Painted Desert, Arizona. No. l|f| 

 $ ad., U. S. National Museum, Biological Survey Collection. Septem 

 ber 22, 1899. C. Hart Merriam and Vernon Bailey. Original No. 504. 



Character*. Si/e medium; coloration ver\" pale golden fulvous: ros- 

 t i'u ni strikingly hr<><i<l. 



Color. Upperparts uniform pale ochraceous buff without appreciable 

 admixture of black tipped hairs; underparts, feet, and tail whitish. 



Cranial character*.- Skull unique: heavy, massive and angular but 

 not ridged; roxtrum broadly e.r/tatitled and broade*t at bam', the great 

 breadth being in the premaxilhi 1 : nasals constricted in middle, slightly 

 notched behind, and falling far short of premaxillae; zygomata moder 

 ately spreading, angular, their outer sides parallel; bullte medium, 

 smaller than in aureus; interparietal broadly pentagonal, 



Mea*nremcnts. Type specimen ($ ad.) : c total length 232; tail verte 

 brate 79: hind foot 33. 



19 BIOL. Soc. WASH. VOL. XIV, 1901. (107) 



