1911J Taylor: Mammals of the 1909 Nevada Expedition. 281 



enlarged, signifying sexual activity. A female (no. 8116) con- 

 tained three embryos. One specimen (no, 8120) was evidently 

 born this year. It was caught at Big Creek Ranch (altitude 4350 

 feet), June 10, 1909. 



Osgood (1900, p. 31) gives the distribution of nevadensis as 

 Upper Sonoran zone of central Nevada; northward to southern 

 Oregon and northern Utah. Our collections add to the number 

 of record stations, the nearest of those listed by Osgood being 

 Tumtum Lake in Harney County. Oregon, and Golconda, east 

 of Winnemucca, Nevada. Quinn River Crossing is about midway 

 between these two localities. 



Zapus princeps oregonus Preble. 

 Blue ^Mountains Jumping Mouse. 



Status. — Our specimens of Zapus are referred to this form 

 by Dr. C. Hart Merriam and Mr. E. A. Preble. As nearly as 

 can be ascertained (largely from a study of the original descrip- 

 tion, Preble, 1899, p. 24) without comparable specimens of ore- 

 go nus from the type locality, the Nevada animals are, however 

 not entirely typical of that form, being smaller than published 

 measurements, and having nearly obsolete the narrower lateral 

 stripe separating the color dorsally from the pure white under- 

 parts. 



There is at hand a series of Zapus from the Warner ]\Ioun- 

 tains, California, just south of the Oregon line, and presumably 

 not far from the type locality of Zapus major Preble. The Warner 

 ]\Iountains of California are directly west of and visible from 

 the Pine Forest JMountains of Nevada, the two ranges being eighty 

 to ninety miles apart. These specimens of major, while not strik- 

 ingly different from our Nevada Zapus, nevertheless do show 

 differentiating characters. For example, the Warner JMountain 

 animals are darker dorsally, the effect being due to an admixture 

 of more black hairs. The sides are near an ochraceous-buff, as 

 against the buffy of the series of oregonus. The dorsal darkening 

 of major extends anteriorly onto the face, which averages defin- 

 itely darker than in the Nevada animals. The narrow lateral 

 stripe separating the dorsal coloration area from the pure white 



