362 University of California Publications in Zoology IY° L - 10 



Perognathus fallax pallidus Mearns 

 Pallid Pocket Mouse 



Our collecting showed this to be the most abundant species 

 of coarse-haired pocket mouse around the desert base of the 

 San Jacinto Mountains, where it was found to occupy hilly 

 ground in high Lower Sonoran. The local range of the species 

 may be inferred from the localities of capture, namely: Dos 

 Palmos Spring, 3000 to 3500 feet, twenty-six specimens (nos. 

 1968-1989, 9360-9363) ; Palm Canon at 3000 feet, six specimens 

 (nos. 2059-2061, 2064, 9358, 9359) ; Palm Canon near mouth 

 at 800 feet, two (nos. 2062, 2063) ; Snow Creek, 1500 feet, thir- 

 teen (1589-1597, 1618-1621); Cabezon, 1700 feet, twenty-six 

 (nos. 1365, 1381-1403, 9356, 9357). 



As remarked under P. f. fallax, our small series from Ban- 

 ning, well up towards the top of San Gorgonio Pass, are inter- 

 mediate towards fallax. This is to a perceptible degree also true 

 of some examples from Dos Palmos Spring. In other words, the 

 Snow Creek and Cabezon series are palest ; only these justify the 

 employment of a separate name. 



Perognathus californicus femoralis Allen 

 Dulzura Pocket Mouse 



Fifteen pocket mice of this species were obtained in the San 

 Jacinto region, eleven (nos. 1651-1661) from Schain's Ranch, 

 4900 feet, and four (nos. 2118-2121) from Strawberry Valley, 

 6000 feet. An additional specimen, believed to be of the same 

 species, was trapped at Hemet Lake, 4400 feet, but was destroyed. 

 All of these localities are close to the line of blending of the 

 Upper Sonoran with the Transition zone. In consideration of 

 the localities of known occurrence in San Diego County (Dul- 

 zura, Santa Ysabel, Fair Oaks, Witch Creek, Foster, and War- 

 ner Pass) this subspecies belongs clearly to high Upper Sonoran. 



In our efforts to ascertain the status of this rodent, we were 

 led to enquire into the relationships existing between the various 

 pocket mice of the californicus group. The results of our study 

 fail to coincide with the conclusions formulated in the last 

 monograph of the genus (Osgood, 1900, pp. 57-59). The material 



