1913] Grinnell—Swarth : Birds and Mammals of San Jacinto 329 



1908. p. 138) shows not the slightest appreciable difference in 

 colors or proportions. The San Jacinto specimen measures: 

 Length 312, tail vertebrae 14(>. hind foot 38. The present instance 

 furnishes the southernmost station for any flying squirrel along 

 the western side of North America. 



Onychomys torridus torridus (Coues 



Arizona < Grasshopper Mouse 



Nine specimens of grasshopper mouse which we refer pro- 

 visionally to this form were obtained, as follows: Snow ('nek. 

 1.">0(l feet, four (nos. 1570, 1571, 1573, 1574): Whitewater. 1130 

 feet, three (nos. 1 T> 7 l' . 1575, 1576) ; Cabezon, 1700 feet, two nos 

 12(>4. 1266). These stations are within the Lower Sonoran zone 

 on the desert base of the mountains, this being probably the 

 extreme western limit of the race of Onychomys inhabiting the 

 Colorado desert. The paleness in coloration of the above 

 examples, both adults and young, as compared with those from 

 San Jacinto Valley, appears to afford sufficient ground for recog- 

 nizing this and the following race from the San Jacinto region 

 as here indicated, although no oilier differential features arc 

 apparent. Bu1 we are considerably in donht as to what name to 

 employ for the representative on 1 he desert side. It is quite 

 probable that this is not at all typical of true torridus; yet we 

 fail to find conclusive evidence to warrant us in using the name 

 perpallidus of Mearns (1896, p. 1 -K > » . The Museum's entire 

 series of Onychomys is inadequate. Mearns himself does not 

 appear to have had much material at his disposal, and his char- 

 acterization is not convincing. 



Onychomys torridus ramona Rhoads 

 San Bernardino Grasshopper .Mouse 

 Pour specimens secured (nos. 2251-2254 i . September 1 to 5, 

 at Vallevista, in San .Jacinto Valley. These are quite like 

 examples from the vicinity of Riverside in their very dark tone 

 of coloration and are evidently to be referred to ramona, thus 

 adding another coast-belt form to the list of those occurring on 

 the western slopes or base of the San Jacinto Mountains. One 



