IIETEROMYID/E lf)5 



pectedly. Dr. Mearns and his assistant Mr. liolzner f;l>tainefl 

 three at the type locality in the extreme southwestern corner 

 of San Diego County, while with the Boundary Survey in 1894. 

 I had the good fortune to get the fourth, an adult female, in the 

 northwestern corner of the same County, in Sept., 1903. These 

 I believe to be the only sj^ecimens yet taken. I caught mine on 

 a dry mesa a short distance back from the seashore. 



Perognathus parvus mollipilosus Coues. (Little; soft 



— liair. ) 



COUES POCKET-MOUSE. 



.Mxjve r>chraceous buff thickly mixed with black; lateral 

 line prominent; below white varying to tawny ochraceous on the 

 belly; antitragus of ear prominently lobed; rostrum rather slend- 

 er; mastoids but moderately developed; interparietal wide. 



Length about 168 mm. (6.60 inches j ; tail vertebrae 88 

 (3.45J ; hind foot 22 (.H6). 



Type locality, old Fort Crook, Shasta County, California. 



Mount Shasta and northeastern California. Coues Pocket- 

 Mice have l^>een taken on Mount Shasta at 7,800 altitude, which 

 is unusually high for any Pocket-Mouse. 



Perognathus parvus olivaceous Mj:rriam. 

 ( vShaded with olive color.) 



GREAT BASIN POCKET-MOUSE. 



Ah)Ove ochracefjus buff thinly mixed with black; lateral 

 line buff; lower parts white, sometimes with plumbeous bases to 

 the hairs; tail brownish above, white below^ mastoids usually well 

 developed. 



Length about 178 mm. (7 inches; ; tail vertebrae 96 (3.75) ; 

 hind foot 23 (.90) ; ear from crown 7.5 ( .30). 



Type locality, Kelton, Utah. 



Great Basin Pocket-Mice range over most of the Great Bas- 

 in, from northern Utah and southern Idaho west to the eastern 



