1913] Grinnell-Sivarth: Birds and Mammals of San Jacinto 363 



at hand consists of 159 skins with skulls of the calif ornicus group 

 from within the state, all catalogued in the Museum of Vertebrate 

 Zoology. These are representative of the following localities : 

 San Mateo County: Redwood City, Portola, and Corte Madera 

 Creek ; Santa Clara County : Black Mountain ; Monterey County : 

 Monterey and Salinas Valley; San Luis Obispo County: Santa 

 Margarita ; San Joaquin County : 8 miles southwest of Traey ; 

 Merced County : 22 miles southwest of Los Banos ; Madera Coun- 

 ty: Raymond; Kern County: Piute Mts., Walker Pass, Weldon, 

 Onyx, Bodfish and Fay Creek; Tulare County: Trout Creek and 

 Jordan Hot Springs; Ventura County: Matilija, Cuddy Caiion; 

 Los Angeles County : Pasadena, Azusa, Glendora ; San Bernar- 

 dino County: Upper Santa Ana River, San Bernardino Moun- 

 tains; Riverside County: San Jacinto Mountains; San Diego 

 County: Warner Pass, Julian, Witch Creek, Cuyamaca Moun- 

 tains, Poster. 



Each of the characters used by Osgood in diagnosing the 

 species concerned was tested by us with the following results : 



(1) Coloration. — We find that in all of the forms, as far as 

 indicated by available material, the fresh fall pelage is much 

 darker, with more of the black hair-tipping, than the spring 

 coat. Taking this fact into account, the coloration of the pocket 

 mice from San Mateo County all the way to southern San Diego 

 County is uniform. This coastal range includes the habitats of 

 californicus, dispar and femoralis. In the original description 

 of dispar (Osgood, 1900, p. 59) paleness of color was one of the 

 emphasized characters. In the light of our material and the 

 evident seasonal change, the character falls. There is, however, 

 a significant paleness attaching to our specimens from the Kern 

 River region. Here then in the arid interior, color does prove 

 diagnostic, and serves to give basis for the recognition of a 

 separate race, P. c. ochrus (Osgood, 1904, p. 128). 



(2) Quality of pelage. — No appreciable subspecific variation 

 detected by us. 



(3) General size.- — In the accompanying table of measure- 

 ments, which takes account only of old adult perfect specimens, 

 it is to be observed that there is no important modification in 

 size southward from the San Francisco Bay region, until the 



