280 Unircrsitij of California PuhUcations in Zoology. [Vol. 7 



External Measurements of Perognathus nevadensls From Quinn River 

 Crossing, Humboldt County, Nevada. 



For method of taking measurements, see Introduction. 

 All dimensions are in millimeters. 



was evidently an animal in the post-breeding pelage, as it was 

 taken on July 4, and the description seems to accord with the 

 darker coat. Our series was taken May 24 to June 10, and is 

 molting rapidly. Thus for accurate characterization it is neces- 

 sary to distinguish between the two pelages. 



In the original description the dull buffy oehraceous lateral 

 stripe is said to spread out over the belly, leaving only the throat 

 and pectoral region white. The buffy oehraceous in nevadensis 

 from Humboldt County is only a very light wash, so that the 

 general impression one gets from the underparts is white rather 

 than buffy. In two specimens (nos. 8120, 8117) the underparts 

 are pure white, except in the anal region in the case of the latter, 

 which is buff'y. Number 8120 is an adolescent. Its general colora- 

 tion is a slaty gray, and it has the tail very thinly haired. The 

 buffy lateral line, besides, is much paler than in other specimens. 



DiSTRiBiTTioN AND Habits. — PerognatJiUs )tevadensis was 

 taken at two localities only, namely Quinn River Crossing and 

 Big Creek Ranch. The animals did not seem to evince any prefer- 

 ence for the vicinity of streams, l)ut were caught at a quarter 

 to a half mile from water under the low desert brush plants. They 

 lived in very small burrows which were always placed in the 

 neighborhood of the sagebrush (Aiicniisia (ridcnfala) or other 

 l)lant of the open desert association. The animals were evidently 

 not common, as but eight specimens, five females and three males, 

 were caught. One of the latter (no. 8113) had the testes much 



