360 Univi rsity of California Publications in Zoology [Vol. 10 



more emphatically arid Lower Sonoran in its faunal and zonal 

 position than any of the other stations where this genus was 

 found. 



Perognathus panamintinus bangsi Mearns 



Hangs Pocket -Mouse 



An abundant rodent on the Lower Sonoran desert base of 

 the San Jacinto .Mountains. Represented by specimens as fol- 

 lows: Dos Palmos Spring. 3500 feet, six (nos. 1929-1932, 9354, 

 9355); Whitewater, 1130 feet, five (nos. 1487, 1488, 1505 1507); 

 Snow Creek, 1500 feet, thirty | nos. 1471-1486, 1491-1504) ; Cabe- 

 zon, 1700 feet, twenty-nine (nos. 1356 1:564. 1366-1380, 9349- 

 9352) ; Banning, 2200 feet, two (nos. 1489, 1490). Two of these 

 localities are at the upper edge of Lower Sonoran- Dos PalmOS 

 and Banning. The two specimens from Banning show slightly 

 the darkest coloration, perhaps indicating intergradation towards 

 brevinasus. This idea is further substantiated by cranial charac- 

 ters, t he Banning examples presenting shortish rosl ra. In neither 

 of these features, however, is the divergence enough to warrant 

 using the name brevinasus for the Banning specimens. 



All the above listed examples of this pocket mouse were taken 

 in May and June. Two weeks' trapping at Palm Springs in 

 December and January, 1903 and 1904, produced no Perognathus. 

 It is evident that this rodent experiences a period of inactivity 

 in winter. 



Perognathus panamintinus brevinasus Osgood 

 Short-nosed Pockel Mouse 

 Found at but one station. Vallevista, 1800 feet, in San Jacinto 

 Valley. Eight .specimens (nos. "Ji'T.s 2285) were secured there 

 August 31 to September 5. This material shows satisfactorily 

 the characters ascribed to the form brevinasus, both as to color- 

 ation and proportions of body and cranium. The locality of 

 capture lies at the Pacific base of the mountains, and together 

 with the other known stations of occurrence indicates a range 

 coinciding closely with that portion of the Lower Sonoran zone 

 I vim: within the San Dieeran fauna! district. Other localities 



