1913] Griinidl-Su-arth: Birds and Mammals of Sim Jacinto 331 



skins might upon their separate merits be referred to gambeli, 

 and it is patent that the mean of the whole aggregate might 

 fall between typical sonoriensis and typical gambeli; but we feel 

 that the leaning of the mode is most strongly toward the former. 

 The San Jacinto region is again shown to lie on the borderland 

 between two fauna! areas, their distinctive forms here blending 

 or hybridizing, which, is not easy to say. Osgood (1909, pp. 

 68-70, 91) has admirably treated of the problem in similar 

 situations in his revision of the genus Peromyscus. 



Peromyscus boylei rowleyi (Allen) 

 Rowley White-footed House 



Our collection contains 131 specimens apportioned by locali- 

 ties as follows: Garnet Queen Mine, 6000 feet, twenty-three 

 (2008-2028. 9334, 9335) ; Kenworthy, 4500 feet, five (nos. 1790- 

 1794); Thomas Mountain, 6800 feet, twelve (nos. 2218-2228. 

 9337); Hemet Lake, 43(10 feet, two (nos. 2242, 2243); Straw- 

 berry Valley, 6000 feet, twenty-one (nos. 2098-2117. 2128) ; Tah- 

 quitz Valley, 8000 feet, fourteen (nos. 2203-2215, 9336) ; Round 

 Valley, 9000 feet, thirteen (nos. 1767. 1778-1789); Fuller's 

 Mill, 5900 feet, eighteen (nos. 1717, 1728-1744) ; Schain's Ranch, 

 4900 feet, twelve (nos. 1678-1689); Cabezon. 1700 feet, four 

 (nos. 1268, 1269, 1585, 9338) ; Snow Creek. 1500 feet, four (nos. 

 1584, 1586-1588) ; Dos Palmos Spring. 3500 feet, three (nos. 

 1910-1912). 



This species would appear to be about as widely distributed 

 through this region as Peromyscus m. sonoriensis; for it is 

 recorded from fully as many stations. But /'. b. rowleyi has 

 much more marked associational restrictions, being very closely 

 confined to the vicinity of water courses. Although ranging from 

 Lower Sonoran, as at Cabezon, to the highest station in Boreal 

 where any trapping was carried on, the low zone captures were 

 made along streams where the contention might well be made 

 that at least one zone higher was the one really present, although 

 closely hemmed in on either side by the lower zone. The metrop- 

 olis of rowleyi, judging from its distribution elsewhere in south- 

 ern California as well as in the area under consideration, is 



