1911] Taylor: Mammals of the 1909 Nevada Expedition. 267 



observed they testified to the great relative size of the gophers. 

 Holes which were probably used as vents for getting rid of 

 superfluous earth were found leading into many of the main 

 burrows. 



Our trapping of this species was carried on exclusively in the 

 alfalfa and wild-hay fields about the Quinn River and Big Creek 

 ranches. Since the pouch of one specimen contained wnld-hay 

 stalks, and since closely trimmed alfalfa and wild-hay plants 

 were seen about some of the burrows, it may be concluded that 

 these plants form a large part of the animal's food. 



As would be expected, workings were most frequently found 

 in loose earth. We were most successful in securing specimens 

 in decidedly damp soil near an irrigating ditch on the Quinn 

 River Ranch. 



Perodipus microps levipes C. H. .Merriam. 

 Panamint Kangaroo Rat. 



Status. — The kangaroo rats of the genus Perodipus have 

 proven more dil^cult to identify satisfactorily than any other 

 mammals taken by the Nevada Expedition. 



There are at hand three near topotypes of Peroelipus colum- 

 hianus C. H. Merriam the data of which are as follows (all are 

 from the Biological Survey Collection) : 



24182 



- ^ Umatilla, Oregon, Oct. 17, 1890; C. P. Streator. 



23759 



^5 Toiichet, Washington, Sept. 13, 1890; C. P. Streator. 



2^744 



„--- 5 Touehet, Washington, Sept. 11, 1890; C. P. Streator. 

 31 139 



The type locality of columhianus is Umatilla, Oregon. 

 Touehet, Washington, is in Walla Walla County, a little north 

 and west of Umatilla. 



Two topotypes of Perodipus microps levipes C. H. ]\Ierriam 

 are also available (both from the Biological Survey Collection). 



— 9 Grapevine Mountains, Nevada. June 7, 1891 ; E. W. Nelson. 

 40641 "^ '■ 



~^^^J: Panamint Mountains, California, May 24, 1891; E. W. Nelson. 

 41340 ^ 



