HETEROMYID^ 166 



pectedly. Dr. Meams and his assistant Mr. Holzner obtained 

 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 specimens yet taken. I caught mine on 

 a dry mesa a short distance back from the seashore. 



Perognathus parvus moUipilosus Couus. (Little; soft 



— hair.) 



COUES POCKET-MOUSE. 



Above ochraceous 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) ; tail vertebrae 88 

 (3.45); hind foot 22 (.86). 



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



Mount Shasta and northeastern California. Coues Pocket- 

 Mice have been taken on Mount Shasta at 7,800 altitude, which 

 is unusually high for any Pocket-Mouse. 



Perognathus parvus olivaceous Me;rriam. 

 (Shaded with olive color.) 



GREAT BASIN POCKET-MOUSE. 



Above ochraceous 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 vertebrse 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 



