310 CALIFORNIA ACADEMY OF SCIENCES  [Proc. 4TH Srp. 
Peromyscus californicus insignis Rhoads 
Southern Parasitic Mouse 
Original description—Peromyscus insignis Rhoads, Proc. 
Acad. Nat Sci. Phila March 1e05 "pass: 
Type locality—Dulzura, San Diego County, California. 
Synonym—Hesperomys californicus. 
Range—Upper Sonoran zone in southern California from 
San Gabriel Mountains in Los Angeles County south to the 
Mexican line (Osgood, N. Amer. Fauna, 28, 1909, p. 238; 
Mus. Vert. Zool.). 
Peromyscus eremicus eremicus (Baird) 
Desert White-footed Mouse 
Original description—Hesperomys eremicus Baird, Pac. R. 
R. Rep., 8, 1857, pp. 479, 480. 
Type locality—Fort Yuma, Imperial County, California. 
Range—Lower Sonoran zone on Colorado desert and east- 
ern parts of Mohave desert, west to east base of San Jacinto 
Mountains, and north to the Death Valley region (Osgood, N. 
Amer. Fauna, 28, 1909, p. 242; Mus. Vert. Zool.). 
Peromyscus eremicus fraterculus (Miller) 
Dulzura White-footed Mouse 
Original description—V esperimus fraterculus Miller, Amer. 
Nat., 26, March, 1892, pp. 261-263. 
Type locality—Dulzura, San Diego County, California. 
Synonyms—Sitomys herroni Rhoads, Amer. Nat., 27, Sep- 
tember, 1893, pp. 832, 833 (type from San Bernardino Valley 
[= Reche Canyon], San Bernardino County, California) ; 
Sitomys herroni nigellus Rhoads, Proc. Acad. Nat. Sci. Phila., 
October, 1894, p. 257 (type from west Cajon Pass, San Ber- 
nardino County, California). 
Range—San Diegan district west of the desert divide, from 
Nordhoff, Ventura County, southeast to the Mexican line, 
chiefly in Lower Sonoran zone (Osgood, N. Amer. Fauna, 28, 
1909, p. 244; Mus. Vert. Zool.). 
