358 University of California Publications in Zoology [Vol. 10 



The geographical distribution of parvus, as indicated by the 

 stations listed as part of the table of measurements, lies wholly 

 west of the desert divide, and altogether within the Lower Son- 

 oran zone of certain interior valleys hemmed in between the 

 Santa Ana range of mountains on the southwest and the San 

 Bernardino and San Jacinto mountains on the north and east. 



Measurements in millimeters of twenty specimens, both sexes, of 

 Dipodomys merriami simiolus from Palm Springs, Snow Creek, White- 

 water and Cabezon, on the desert side of the San Jacinto Moun- 

 tains. 



Dipodomys deserti deserti Stephens 



Desert Kangaroo Rat 



Pound only at the desert base of the San Jacinto Mountains, 

 whence the Museum contains nine specimens, three (nos. 5903, 

 6933, 6934) from Palm Springs, 450 feet, and six (nos. 1536- 

 1541) from close to the railroad station at Whitewater. 1130 

 feet. The species belongs to the Lower Sonoran zone, and does 

 not in this region invade levels above the sand flats of the desert 

 floor. 



Perodipus agilis agilis (Gambel) 

 Gambel Kangaroo Rat 

 Thirty specimens referable to this species were taken in the 

 San Jacinto region, representing the following stations : Foot- 

 hills one mile south of Banning, 2200 feet, six (nos. 1418-1423) ; 

 Schain's Ranch, 4900 feet, six (nos. 1662-1667); Kenworthy, 

 4500 feet, sixteen (nos. 1818-1827, 1848, 1850, 1859-1861) ; Car- 

 rizo Creek, near Dos Palmos Spring, 3000 and 3500 feet, two 

 (nos. 1916, 1917). 



