FIELD BOOK OF MAMMALS 



lighter on head and shoulders; rump and base of tail dark 

 Vandyke brown; ears black. Total length, 41 inches; tail 

 vertebra?, 18 inches; hind foot, 7 inches; scaly portion of tail 

 10 by 5 inches. Found on Admiralty Island, Alaska. 



Cook Inlet Beaver. — Castor canadensis helugce Taylor. 



Intermediate between typical canadensis and leuccdonta, 

 paler than the latter. Upperparts cinnamon to ochraceous 

 tawny. Found in the Cook Inlet region of Alaska, south 

 to wStuart Lake, British Columbia. 



Carolina Beaver. — Castor canadensis carolinensis Phoads. 

 Larger than typical canadensis, with relatively broader tail. 

 Upperparts bright hazel brightening to cirnamon-rufous 

 on rump. Total length, 45 inches; scaly portion of tail, 11 



Fig. 67. Tail and hind foot of Beaver 



by 6.3 inches; hind foot, 7.4 inches. Found in North 

 Carohna, south to northern Florida and the Gulf of Mexico, 

 west to eastern Texas. 



Broad-tailed Beaver; Sonora Beaver. — Castor canadensis 

 frondator Mearns. 

 Larger, paler, and tail broader than in typical canadensis; 

 paler than carolinensis. Upperparts russet, sides wood- 

 brown; feet burnt sienna. Total length, 45 inches; tail 

 vertebrce, 15 inches; scaly portion of tail, 1 1.4 by 6.2 inches; 

 weight, 62 pounds. Found in the southwestern states from 

 Mexico north to Wyoming and Montana, not known west 

 of about the 115th meridian, 



Rio Grande Beaver. — Castor canadensis mexicanus Bailey. 

 "Size medium, colors dull and pale with very little chestnut 

 at any season . . . Upperparts dull russet, brightest on crown, 

 palest on cheeks and rump." (Bailey) Total length, 43 



330 



