332 CALIFORNIA ACADEMY OF SCIENCES (P«oc. 4th Se». 



Range — Tree-yucca belt (high Lower Sonoran and low 

 Upper Sonoran zones) in vicinity of Walker Pass, Kern 

 County (Mus. Vert. Zool.). 



Perognathus alticola Rhoads 

 White-eared Pocket Mouse 



Original dcscriptio)i — Pcrognatluis alticolus Rhoads, Proc. 

 Acad. Xat. Sci. Phila., December, 1893, p. 412. 



Type locality — Squirrel Inn, near Little Bear Valley, San 

 Bernardino Mountains, San Bernardino County, California. 



Range — Known only from the lower Transition zone in the 

 near vicinity of the type locality (Stephens, Calif. Mammals, 

 1906, p. 166). 



Perognathus baileyi baileyi Merriam 



' Bailey Pocket Mouse 



Original description — Perognathus baileyi Merriam, Proc. 

 Acad. Nat. Sci. Phila., September 27, \S9A-', pp. 262, 263. 



Type locality — Magdalena. Sonora, Mexico. 



Range — Agave belt of Upper Sonoran zone at Mountain 

 Spring, near Mexican boundary, San Diego County (I\Ius. 

 Vert. Zool.). 



Perognathus formosus Merriam 



Long-tailed Pocket Mouse 



Original description — Perognathus formosus Merriam, N. 

 Amer. Fauna, 1, October, 1889, pp. 17, 18. 



Type locality — St. George, Washington County. Utah. 



Synonym — Perognathus )nese)nhriiius Elliot, Field. Col. 

 Mus., zool. ser.. 3, December, 1903, p. 251 (type from Palm 

 Springs, Colorado Desert, Riverside County. California). 



Ra)ige — Upper and Lower Sonoran zones in portions of the 

 Mohave desert region ; northwest through the Inyo region at 

 least to Lone Pine and the Inyo Mountains; southwest to the 

 north base of the San Bernardino [Mountains and to La Puerta, 

 eastern San Diego County ; southeast to the Colorado River 

 at Pilot Knob, Imperial County (Mus. Vert. Zool.; Osgood, 

 N. Amer. Fauna. 18, 1900, p. -11). 



