Merriam New Kangaroo Rats. 115 



Perodipus ordi columbianus subsp. uov. 



Type from UMATILLA, PLAINS OF COLUMBIA, OHEGON. No. ^504 9 ad. U. 

 S. Nat. Museum. Department of Agriculture Collection. Collected Oct. 18, 

 1890, by Clark P. Streator (Original number 380). 



Measurements (taken in flesh). Type: Total length 2f>4 ; tail vertebrae 148 ; 

 hind foot 40. Ear from anterior base 13 (in dry skin). 



Average measurements of 15 specimens from type locality : Total length 

 244.5 ; tail vertebra 140.5 ; hind foot 39. 



General characters. Similar to P. ordi but less ochraceous in 

 color and with markings more pronounced; ears blackish instead 

 of flesh color ; supraorbital white spots more conspicuous. 



Color. Upper parts clay-color, finely mixed with dark-tipped hairs ; 

 thigh patches large, more tinged with ochraceous than rest of upper parts, 

 this color reaching down on inner side of leg in a narrow stripe to heel [no 

 dusky on inner side of leg] ; facial crescents blackish and nearly continuous 

 with a blackish spot on end of nose ; supraorbital white spots unusually 

 conspicuous ; interior of ear conch and reflexed upper border blackish ; 

 back side of ear whitish ; dorsal and ventral tail stripes dusky, the ventral 

 failing or nearly failing on terminal fourth, where the white sides stripes 

 commonly meet or nearly meet for a short distance ; tip of tail dusky all 

 round from upper stripe. 



Cranial characters. The skull of columbianus differs from that of typical 

 ordi in having the basioceipital much broader, the postero-external angle of 

 the maxillary wing of the zygoma more strongly produced backward and 

 downward and the angle of the mandible larger. 



