Vol. Ill] GRINNELL—MAMMALS OF CALIFORNIA 323 



ing. An immigrant from Europe. In west-central California 

 a variation has appeared, of possible phylogenetic importance 

 (Dice, Science, n. s., 35, 1912, pp. 834-836). 



Family GEOMYIDAE 



Thomomys bottae bottae (Eydoux and Gervais) 



California Pocket Gopher 



Original description — "Oryctomys (Saccophoriis) bottae 

 , Eydoux and Gervais, Mag. de Zool., 6, 1836, p. 2i, pi. 21." 



Type locality — Coast of California: Monterey (see Allen, 

 Bull. Amer. Mus. Nat. Hist., 5, 1893, p. 57). 



Synonyms — Thomomys talpoidcs bidbivorus; Thomomys 

 bidbivorus. 



Range — Upper Sonoran and Transition zones in the San 

 Francisco Bay region, south along the coast to Ventura County, 

 and north at least through Marin County; east into Contra 

 Costa County (Mus. Vert. Zool.). 



Thomomys bottae pallescens Rhoads 

 San Diego Pocket Goplier 



Original description — Thomomys bottae pallescens Rhoads, 

 Proc. Acad. Nat. Sci. Phila., March 19, 1895, p. 36. 



Type locality — Grapelands, San Bernardino County, Cali- 

 fornia. 



Synonym — Southern Pocket Gopher. 



Range — Lower and Upper Sonoran zones in the San Diegan 

 district, from the Mexican line northwest into Ventura County 

 (Mus. Vert, Zool). 



Thomomys bottae laticeps Baird 

 Humboldt Bay Pocket Gopher 



Original description — Thomomys laticeps Baird, Proc. 

 Acad. Nat. Sci. Phila., 7, April, 1855, p. 335. 



Type locality — Humboldt Bay, Humboldt County, Cali- 

 fornia. 



Synonyms — Thomomys bottae, part; Broad-headed Pocket 

 Gopher. 



Range — Transition zone in the humid coast belt in the vicin- 

 ity of Humboldt Bay (Mus. Vert. Zool.). 



