FIELD BOOK OF MAMMALS 



cially rump, usually buff to roots; well-defined, transverse, 

 blackish nose stripes. Total length, 5.2 inches; tail verte- 

 brae, 2.5 inches; hind foot, .74 inch. Found in "a few 

 scattered localities in extreme southwestern California. 

 Upper Sonoran Zone," (Osgood) 



Yuma Pocket Mouse. — Perognathus homhycinus Osgood. 

 Resembling hangsi in size and color. Upperparts pale 

 vinaceous buff sparingly mixed with dusky; well-developed 

 white spot at anterior base of ear ; ears edged with whitish ; 

 underparts white. Total length, 5.4 inches; tail vertebras, 

 3.2 inches; hind foot, .74 inch. Found from Yuma County, 

 Arizona, west into Imperial County, California, south into 

 Mexico. 



Nevada Pocket Mouse. — Perognathus nevadensis Merriam. 

 Resembling panamintinus but smaller, darker, and under- 

 parts colored like sides. Total length, 5.3 inches; tail ver- 

 tebrae, 2.9 inches; hind foot, .75 inch. Found in "Upper 

 Sonoran Zone of central Nevada; northward to southern 

 Oregon and northern Utah." (Osgood) 



Pacific Pocket Mouse. — Perognathus pacificus Meams. 



Smallest of the genus ; pelage very soft ; color similar to that 

 of brevinasus. Upperparts pinkish buff sprinkled with 

 black; tail nearly unicolor; ears dusky; underparts white. 

 Total length, 4.5 inches; tail vertebrae, 2.1 inches; hind foot, 

 .6 inch. Found only near Mexican boundary monument 

 No. 258, shore of Pacific Ocean, San Diego County, Cali- 

 fornia. 



Loring Pocket Mouse. — Perognathus amplus Osgood. 



Size large; tail long; sole of hind foot naked for lower four- 

 fifths; pelage long and soft. Upperparts pinkish buff 

 lightly marked with black ; buff lateral line wide and dis- 

 tinct; tail buff, mixed with black above; underparts white. 

 Total length, 6.2 inches; tail vertebrae, 3.2 inches; hind foot, 

 .8 inch. Found near Fort Verde, Yavapai County, Arizona. 



San Joaquin Pocket Mouse. — Perognathus inornatus inornatus 

 Merriam. 

 Size of apache, pelage rather harsh, sole of hind foot hairy 

 on upper third. Upperparts buff, mixed with black; lateral 

 line indistinct ; ear buffy outside, dusky inside, a white spot 

 at base; buff on upperside of forelegs and on tail; under- 

 parts white. Total length, males, 5.8 inches, females, 5.4 

 inches; tail vertebrae, males, 3 inches, females, 2.8 inches; 

 hind foot, males, .75 inch, females, .73 inch. Found in the 

 vicinity of San Joaquin Valley, California. 



McKittrick Pocket Mouse. — Perognathus inornatus neglectus 

 (Taylor). 

 Larger than typical inornatus. Upperparts ochraceous 

 buff with very little admixture of black; feet and underparts 

 pure white. Total length, 6.2 inches; tail vertebrae, 3 

 inches; hind foot, .84 inch. Found in Lower Sonoran Zone 

 of Kern and San Luis Obispo Counties, California. 



304 



