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 IX MILLIMETERS OF TWEXTY SPECIMEXS, BOTH SEXES, OP 



Dipodomys merriami simiolus from Palm Scrix<;s, Snow ('reek, White- 

 water axd Cabezon, on the desert side of the Sax .Iaoixto Moux- 



TAINS. 



Average of till (8 $$ + 12 Jd) 



Mean 



Maximum 



M i ii i mum 



I Vr rent (it \ ;i rial inn OD either 



side di' mean 



Dipodomys deserti deserti Stephens 



I >esert Kangaroo Eta1 



Found only at the desert base of the San Jacinto .Mountains. 

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

 0933. 6934) from Palm Springs, 450 feet, and six (nos. 1536- 

 1541) from close to the railroad station at Whitewater, 11:50 

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

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

 floor. 



Perodipus agilis agilis (Gambel) 



( iainbel Kangaroo Hat 



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. 1818-1 S27. 1848, 1850. 1859-1861) ; Car- 

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

 (nos. 1916, 1917). 



