UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 21, No. 6, pp. 239-244, 6 figures in text November 7, 1921 



TWO NEW RODENTS (GENERA THOMOMYS 



AND MARMOT A) FROM THE EASTERN 



BORDER OF CALIFORNIA 



BY 



JOSEPH GEINNELL 



(Contribution from the Museum of Vertebrate Zoology of the University of California) 



Further studies upon the collections of Californian mammals 

 accumulated during the past few years in the Museum of Vertebrate 

 Zoology have brought to light the existence of several new races. Two 

 of these races, from the far eastern border of the State, in Inyo and 

 Mono counties, are here characterized. A better knowledge of their 

 relationships with previously described forms has been made possible 

 by the opportunity recently afforded the writer of studying pertinent 

 material in the National Museum in Washington. The collections 

 housed there belonging to the United States Biological Survey proved 

 invaluable. 



Thomomys perpallidus amargosae, new subspecies 

 Amargosa Pocket Gopher 



Type.— Male, old adult, skull and skin (in molt) ; no. 26485, Mus. 

 Vert. Zool. ; Shoshone, 1560 feet altitude on the Amargosa "River," 

 Inyo County, California ; May 14, 1917 ; collected by Tracy I. Storer ; 

 original no. 1777. 



Diagnosis.— A TJiomomtjs of the "perpallidus group" (see Bailey, 

 1915, pp. 33, 68-80) . Size large ; general coloration moderately pallid, 

 dull 'or dusky pinkish buff with a curious suggestion of reed yellow- 

 not whitish or strongly ochraceous or orange buff ; skull heavy and 

 broad, with widely spreading and angular zygomatic arches. 



Measurements.— ^ee Table I ; comparisons should be made with the 

 figures given by Bailey (1915) and by Grinnell (1918). 



