MAMMALS OF THE MEXICAN BOUNDARY. 



413 



Measurements of 50 specimens of Peromyseus arizonse. — Continued. 



PEROMYSCUS BOYLII (Baird). 

 CALIFORNIA BRUSH MOUSE. 



Hesperomys boylii Baird, Proc. Acad. Nat. Sci. Philadelphia, VII, p. 335, Apr., 1855 



(original description); Mam. N. Am., 1857, p. 471, pis. viii, fig. 3; pi. lii, fig. 3 



(description and figures). 

 Peromyseus major Rhoads, American Naturalist, XXIX, pp. 831, 832, Sept. 1, 1893 



(Squirrel Inn, San Bernardino County, California). 

 Peromyseus hoylii, Mearns, Proc. U.S. Nat. Muf=., XIX, p. 139, Dec. 21, 1896.— 



Miller and Rehn, Proc. Bost. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 1901, 



p. 69 (Syst. Results Study N. Am. Mam. to close of 1900). 

 [Peromyseus". 6oyZ(i, Elliot, Field Col. Mus.,Zool. Ser., II, 1901, p. 132 (Synop. Mam. 



N. Am.); IV, 1904, p. 195 (Mam. Mid. Am.). 



Type-locality .—Middle Fork of the American River, ICldorado 

 County, California. (Type, skin — formerly mounted — and skull, Cat. 

 No. yWo, U. S. National Museum.) 



Geographical range. — Upper Sonoran and Transition zones of the 

 interior of California, reaching the coast in southern and Lower 

 California. 



Description. — Upper surface broccoli brown, tinged with cinnamon 

 along cheeks, sides, and rump, and darkened on the back by black- 

 tipped hairs; under surface and feet pure white; orbital area dusky; 

 ears coated with short down of the same color as the surrounding 

 parts; tail bicolor, clove brown above, white below. In winter speci- 



