147- canadensis. {Castor), Kuhl. Beit. Zool., 1820, p. 64. 



anieruaniis^ Penn., Arctic Zool., 1784, i, p. 98. F. Cuv. Mam., 

 pi. 274, 1825. 



Type locality. Hudson Bay. 



Geogr. Distr. Northeastern North America from northern tree 

 limit to United States, and west to Cascade Mountains. 



Genl. Char. Size smallest of American species: scaly portion of 

 tail twice as long as wide. 



Color. Winter Pelage. General color blackish brown, hairs 

 tipped with chestnut; top and sides of head and neck, rump and 

 thighs chestnut. Ears black. Feet, legs and under parts seal 

 brown. 



Measurements. Total length, 1130; tail vertebra-, 410: hind 

 foot, 176; length of skull, 132, breadth, 93;' length of nasals, 46, 

 breadth. 21.4. 



a.—caroUnensis. (Castor), Rhoads, Proc. .\m. Philos. Soc, i8g8, 

 p. 420. 



Ty/e locality. Dan River, near Danbury, Stokes count)', North 

 Carolina. 



Geogr. Distr. North Carolina west to Louisiaaa. 



Genl. Char. Size larger than C. canadensis; tail broader. 



Color. Above hazel; under fur seal brown; lower part of back 

 and rump cinnamon rufous; ears blackish; sides of head hair brown. 

 Under parts, throat to vent broccoli brown; vent burnt umber; feet 

 bister. 



Measurements. Total length, 1130; scaly part of tail, 279 x 158; 

 hind foot, 184. Length of skull, 148, breadth, 107; length of nasals, 

 43.5, breadth, 29. 



h.~fondatnr. (Castor), Mearns, Proc. U. S. Nat. Mus., 1897, p. 5. 



Ty/e locality. San Pedro River, Sonora, Mexico. Near Mexi- 

 can boundary monument No. 98. 



Geogr. Distr. From Mexico to Wyoming and Montana, inter- 

 grading into the other forms wherever the limits of their dispersions 

 meet. 



Genl. Char. Size large; scaly portion of tail less than twice as 

 long as wide. Skull massive; rostrum short and wide; nasals tumid. 



Color. Above russet, chocolate at root of tail; grayish cinna- 

 mon to ferruginous beneath tail; sides wood brown varied with 

 tawny olive; feet burnt sienna. 



Measurements. Total length, 1070; tail vertebrae, 360: scaly 

 portion of tail, 290x125; hind foot, 185. Length of skull, 133: 

 breadth, 99. 



