336 VERTEBRATE ANIMALS OF THE UNITED STATES 



E. m. pallidus (Allen). Color ochraceous buff; length 220 mm.; tail 

 120 mm.; hind foot 35 mm.: South Dakota, Montana, Wyoming and 

 western Nebraska, in the Great Plains. 



E. alpinus (Merr.). Like E. m. pictus, but paler; tip of tail black; 

 length 189 mm.: high Sierras, California. 



4. CallospermophilusMerriam. Golden chipmunks; rock squirrels. 

 Body heavy, with i white and 2 black stripes on each side; head, fore 

 limbs and neck uniform reddish or yellowish brown; dentition i/i, 0/0, 

 2/1, 3/3: about 12 species and subspecies, in mountain States of the 

 far-west, in forests of pine and fir; in feeding habits similar to chip- 

 munks; they hibernate often from 5 to 7 months; a single litter of 4 to 7 

 young raised. 



C. lateralis (Say). Color of back reddish brown; lateral stripe broad 

 and bordered above and below by a black stripe; under parts pale 

 brownish gray; length 275 mm.; tail 100 mm.; hind foot 43 mm.: 

 California, Arizona and New Mexico north into Canada; Transition 

 and Lower Boreal zones. 



Subspecies of C. lateralis 



C. I. saturatus (Rhoads). Size larger; length 317 mm.; colors 

 darker: central Washington, Cascade Mountains. 



C. I. castanurus (Merr.). Head and shoulders chestnut; length 284 

 mm.; tail 92 mm.; hind foot 43 mm.: Wasatch Mountains, Utah. 



C. I. cinerascens (Merr.) . Head and shoulders chestnut ; color of back 

 grizzled gray: from Yellowstone Park, north through Idaho, Montana 

 and northwards. 



C. /. wortmani (Allen), Color yellowish gray, mixed with black; 

 neck and shoulders deep ochraceous; length 280 mm.; tail 95 mm.; hind 

 foot 42 mm.: Wyoming and northwestern Colorado. 



C. chrysodeirus (Merr.). Head, neck and shoulders ochraceous; 

 black stripes more distinct: eastern Oregon and northern California. 



C. bernardinus (Merr.). Similar to the above; length 275 mm.; 

 tail 90 mm.; hind foot 42 mm.: southern California. 



5. Ammospermophilus Merriam. Antelope chipmunks; ground 

 squirrels. Size small; one whitish lateral stripe; tail very short and 

 carried curved over the back; skull very broad; dentition i/i, 0/0, 2/1, 

 3/3: 7 species and subspecies, in arid plains; several litters of young 

 raised a year, of from 4 to 1 2 each. 



A. leucurus (Merr.). Color grizzled yellowish brown above and 

 yellowish white beneath; tail grizzled blackish above and white below; 



