MAMMALS 317 



T. b. leucodon (Merriam). Smaller, lighter: from Fairfield and 

 Placerville to Grants Pass, Oregon. 



T. b. navus (Merr.). Much smaller; color lighter: Sacramento 

 Valley. 



T. b. mewa Merr. Size smaller; color darker: east side of San 

 Joaquin Valley. 



T. b. angularis (Merr.). Size large; color light: west side of San 

 Joaquin Valley; also Santa Clara and San Juan Valleys. 



T. bulbivorus (Richardson). Color dark brown, above and below; 

 length 300 mm.; tail 90 mm.; hind foot 42 mm.; mammae 4 pairs: 

 Willamette Valley. 



T. townsendii (Bachman). Color dark gray above, buff below; 

 length 305 mm.; tail 100 mm.; hind foot 38 mm.; mammae 4 pairs; in 

 dark color phase black all over: southern Idaho and Oregon and 

 northern Nevada. 



T. alpinus Merr. Color yellowish brown, being darker along the 

 back and lighter on the belly; mammae 4 pairs; length 222 mm.; tail 61 

 mm.; hind foot 30 mm.: upper levels of the southern Sierras. 



T. perpaUidus (Merr.) . Color buff or cream above, whitish beneath ; 

 length 241 mm.; tail 84 mm.; hind foot 31 mm.; mammae 4 pairs: 

 deserts of southern California to New Mexico and Colorado: 14 

 subspecies. 



Subspecies of T. perpaUidus 



T. p. perpaUidus (Merr.). Colorado desert, southern California. 



T. p. per pes (Merr.) . Size small ; color gray : eastern California from 

 Owens Valley to Hesperia. 



T. p. canus (Bailey). Color grayish buff; size rather large: western 

 and central Nevada. 



T. p. aureus (Allen). Color golden buff'; size rather large: southern 

 Nevada and Utah, western Colorado, New Mexico and Arizona. 



T.fulvus (Woodhouse). Color dark tawny or light chestnut; length 

 219 mm.; tail 70 mm.; hind foot 30 mm.; mammae 4 pairs: Arizona to 

 Texas; 8 subspecies. 



Subspecies of T. fulvus 



T. f. fulvus (Woodh.). Central Arizona and western and central 

 New ^Mexico, 



T.f. toUecus (Allen). Color paler and grayer: southeastern Arizona 

 and southwestern New Mexico. 



