102 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sek. 



Ventura County, no date. No. 145271 : obverse of label "679a 

 San Diego Cal Dec 6th '61 J. G. C." 



Skins all prepared as was customary by Cooper, skulls inside, 

 fore feet either extended anteriorly or bent back on breast, hind 

 feet folded forward beneath the body posteriorly or extended 

 irregularly backward; tail not skinned, in two specimens (Nos. 

 11933, 145271, U. S. Nat. Mus.) broken off completely and 

 missing. 



Nos. 5615 and 5617 (Univ. Cialif. Mus. Vert. Zool.) are 

 young animals. While the pelage appearance of Nos. 5613, 

 5614 (Univ. Calif. Mus. Vert. Zool.) from San Mateo, Cali- 

 fornia, indicates a condition of molt, close examination of the 

 skin does not disclose the darkened appearance usually so char- 

 acteristic of the molting process. No. 5616 (Univ. Calif. Mus. 

 Vert. Zool.) is an adult specimen with an unusually intense 

 reddish brown coloration, somewhat resembling Thonwmys 

 hott(2 leucodon in summer pelage. The coloration of No. 

 11933 (U. S. Nat. Mus.) from Saticoy, California, comes well 

 within the range of variation of T. b. hotter; while a bright- 

 colored example from San Diego (No. 145271, U. S. Nat. 

 Mus.) is very similar to specimens of hott<£ in the Biological 

 Survey collection from Twin Oaks, California (compare Nos. 

 100161, 100164). The specimens in the collections of the 

 National Museum were identified by Vernon Bailey of the U. 

 S. Biological Survey. 



Thomomys bottae pallescens Rhoads 



"Thomomys umbrinus" (part). Cooper, Zoology, in Cronise, 

 The Natural Wealth of California, 1868, p. 446 ("found in the 

 southeast quarter [of the state]") ; Amer. Nat., 3, 1869, p. 183 

 (Southern part of California). 



"Thomomys umbrinus Rich." (part), Cooper, Proc. Cal. 

 Acad. Sci., 4, 1870, p. 68 (does not extend north of the south- 

 ern coast slope). 



Specimen examined. — One : No. 145273, U. S. Nat. Mus. ; 

 obverse of label "273 Thomomys ['umbrinus?' written on in 

 pencil] 6 Cajon Pass, W. Slope. Cal. June 8 '61, J. G. C." 



Skull inside skin ; fore feet crossed on breast ; hind feet and 

 tail disposed posteriorly; tail not skinned. 



