SCIDRIDvE 75 



above, the hairs being black at rcx)t, then white, then black and 

 tipped with white; tail often tinged with salmon above at base. 



Length about 210 mm. (8.25 inches) ; tail vertebije 66 

 (2.60) ; hind foot 37 (1.45) ; ear from crown 6 (.25). 



Type locality, San Gorgonio' Pass, below Banning, Califor- 

 nia. 



Antelope Ground-Squirrels are more or less common in the 

 hills bordering the Colorado and Mohave Deserts and in rocky 

 places in these Deserts and north tO' Dassen County. In a very 

 few places they occur a short distance down on the Pacific slope. 

 They are not often seen out on open plains, preferring rocky 

 localities. 



The food is principally seeds as is usual with Ground-Squir- 

 rels. The cheek pouches together will hold more than a heaping 

 , teaspoonful of seeds. The note is a loud, prolonged, tremulous 

 whistle. The breeding season is early, March and April. Five 

 to eight is the usual number of young. In running these 

 Ground-Squirrels carry their tails curled over their backs, the 

 underside of the tail appearing like a white rump, hence their 

 common name. 



Citellus nelsoni Merriam. (For E. W. Nelson.) 



NELSON GROUND-SQUIRREL. 



Similar to Icucnnis but larger and paler; above dull yellow- 

 ish brown or buffy clay color, dark beneath the surface; white 

 lateral stripe tinged with ochraceous; outer surface of legs and 

 uiDper side of tail near base, bufify clay color ; remainder of upper 

 side of tail black and white, the white border broad ; lower part 

 bufify white. In winter the back is nearly as dark as leuciinis. 



Length about 223 mm. (8.65 inches) ; tail vertebrae 70 

 (2.75) ; hind foot 40 (1.60). 



Type locality, Tipton, San Joaquin County, California. 



The Nelson Ground-Squirrel is found in the southern part 

 of the San Joaquin Valley, where it is common in a few places. 



