638 



THE MONTHLY BULLETIN. 



Mohave Desert from the mountains east of Owens Lake south to the 

 Santa Rosa Mountains west of Salton Sea. 



In altitude this squirrel ranges from 450 feet, as at Palm Springs 

 at the eastern base of San Jacinto Peak, to 10,500 feet, as within a 

 quarter of a mile of the summit of the same mountain (H. S. Swarth, 

 MS). It is to be found from the southernmost plains of the San 



Fig. 17. Map showing California distribution of the California, Fisher, Catalina 

 Island and Douglas ground squirrels, and the Rock Squirrel, all being of the "digger" 

 category. The spots represent localities from which actual specimens have been 

 examined. 



Joaquin Valley to 10,000 feet altitude in the Mount Whitney region. 

 This rodent thus shows little regard for zonal limitations, occurring all 

 the way from the Lower Sonoran zone to the Canadian zone, though 

 its numbers above the Upper Sonoran are small. It is equally at home 



