334 University of California Publications in Zoology [Vol. 1° 



Peromyscus crinitus stephensi Mearns 



Stephens Canon Mouse 



Detected at but one station, Dos Palmos Spring, 3500 feet, 

 where two adults (nos. 1908, 1909) were trapped June 1, along 

 the steep rocky wall of the ravine just below the two palms from 

 which the place receives its name. These specimens are quite 

 indistinguishable from the Museum series of the species from 

 Victorville on the Mojave Desert and from the California side 

 dt' the ( !olorado River. 



Peromyscus californicus insignis Rhoads 

 Southern Parasitic Mouse 



Thirty-five specimens obtained, as follows: Tahquitz Valley, 

 8000 feet, one (no. 2198) ; Kenworthy, 4500 feet, two (nos. 1795, 

 1796) ; Schain's Ranch, 4900 feet, fifteen (nos. 1690-1697, 1708- 

 1714); Banning, 2200 feet, three (nos. 1414-1416); Cabezon, 

 1700 feet, thirteen (nos. 1267, 1323-1332, 1581, 1582); Snow 

 Creek, 1500 feet, one (no. 1583). 



The distribution of this mouse is typically Upper Sonoran, 

 coinciding with the chaparral belt of that zone. The single 

 example from Tahquitz Valley was far up in Transition, though 

 in actual distance the interval to be traversed in reaching the 

 place was not great ; a belt of cherry and manzanita brush was 

 continuous down the slope to the east. Of casual interest is the 

 fact that not one example of this mouse was taken as a result 

 of all our trapping in Tahquitz Valley ; the specimen obtained 

 was found drowned in a pitcher of milk at the summer camp 

 in the valley. 



The occurrence of the species so far down zonally as Cabezon 

 and Snow Creek is noteworthy, for especially the latter point is 

 well into Lower Sonoran. As far as we are able to discern the 

 scries from the desert slope differ in mi way from those from 

 the Pacific slope, and these in turn are identical with topotypes 

 of insignis from Dulzura, San Diego County. 



