Page:Natural History of the Ground Squirrels of California.djvu/52

638 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



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