FIELD BOOK OF MAMMALS 



Winter pelage unknown. Total length, males, 9.2 inches, 

 females, 8.2; tail vertebras, males, 3.1 inches, females, 2.6; 

 hind foot, males, 1.3 inches, females, 1.2. Has been found 

 only on "San Antonio Peak (Bear Flat Meadows at 6,400 

 feet altitude) in the San Gabriel Mountains, California." 

 (Bailey) 

 San Jacinto Pocket Gopher. — Thomomys jacinteus Grinnell 

 and Swarth, 

 Superficially resembling nigricans, but more closely related 

 to 7ieglectus. Upperparts (summer) rich ochraceous, dark 

 in tone, sprinkled with black-tipped hairs which are thickest 

 along dorsal region ; underparts ochraceous, brighter in tone 

 than upperparts. Winter pelage with more black on upper- 

 parts. Total length, males, 9.5 inches, females, 9.3; tail 

 vertebra, males, 3.2 inches, females, 3.04; hind foot, males, 

 1.28 inches, females, 1.16. Found on "Upper slopes of San 

 Jacinto Mountains, Cal." (Bailey) 



Perpallidus Group 

 Characterized by buffy or yellowish coloration (except 

 apache) and by mamma in four pairs (inguinal, 2-2 ; pectoral, 



2—2). 



Palm Springs Pocket Gopher. — Thomomys perpallidus perpal- 

 lidus (Merriam). 

 Color very pale; ears small ; tail long. Upperparts (summer) 

 buffy to cream color; dusky about ear, grayish brown on 

 nose and cheeks; feet and tail whitish; underparts whitish. 

 Winter pelage even paler than summer. Total length, 

 males, 9.6 inches, females, 8.6; tail vertebrse, males, 3.4 

 inches, females, 3.1; hind foot, males, 1.26 inches, females, 

 1.20. Found in "Colorado Desert, southern California, 

 from Whitewater south to Salton Sea." (Bailey) 



White Pocket Gopher. — Thomomys perpallidus albatus (Grin- 

 nell). _ 

 Larger in size, paler in color than typical perpallidus. Up- 

 perparts pale buff to cream color; grayish brown on nose 

 and about ears; feet and tail with sparse, short, white hairs, 

 nearly naked; underparts creamy to white, with dark color 

 of underfur absent or much reduced. Winter pelage like 

 summer but with more extensive dark underfur on abdo- 

 men. Total length, males, 10.9 inches, females, 9.2; tail 

 vertebrae, males, 4.0 inches, females, 3.2; hind foot, males, 

 1.4 inches, females, 1.36. Found in "Southeastern Cali- 

 fornia and northeastern Lower California from Carrizo 

 Creek south to Gardner's Lagoon, Salton River." (Bailey) 



Yellow-backed Pocket Gopher. — Thomomys perpallidus chry- 

 sonotus Grinnell. 

 Smaller than typical perpallidus; ears very small; pelage as 

 in perpallidus. Upperparts (summer) pale buff to buff; 



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