bilobed blade, compressed, the hinder lobe the larger, with two 

 cusps and a raised interior border. 



450. occidentalis. (Cant's), Rich. Faun. Bor. Am., 1829, p. 60. 

 griseis, Rich. Faun. Bor. Amer. , 1829, p. 66. 



alt-r, Rich., Faun. Bor. Amer., 1829, p. 115. 



occidtntalis var. rufus, Aud. & Bach. N. A. Quad., 1851, 11, p. 

 240, pi. IxxxU. 



Type locality. Not given. Plains of Saskatchewan ? 



Geogr. Disir. Western North America to Nebraska and Idaho, 

 south to Mexico, north to Greenland; rare in United States east of 

 the Mississippi. 



Genl. Char. Size very large, color usually light, white to grizzled 

 gray. 



Color. The color of this species varies greatly from all white 

 through different degrees of gray to all black; majority gray and 

 white tinged with brown. Doubtfully distinct from C. lupus of the 

 Old World. 



Measurements. Total length, 1,449; tail vertebrse, 399. 



451. nubilus. (Cants), Say, Long's Exped. Rocky Mts., 1823, i, 



p. 169. 



Type locality. Prairie near Council Bluffs, Iowa. 



Geogr. Distr. Great Slave Lake to longitude of Idaho, south to 

 Nebraska and to California ? 



Genl. Char. Size large, color sooty or plumbeous brown. 



Color. Say's description of type. " Dusky color, the hair cin- 

 ereous at the base, then brownish black, then gray, then black; the 

 gray of the hairs combining with the black tip to produce a mottled 

 appearance; the gray predominating on the sides. Ears short, deep 

 brownish-black, with a patch of gray hair within. The under parts 

 dusky ferruginous, grayish with long hairs between the thighs and 

 with a large white spot on the breast, the ferruginous color very 

 much narrowed on the neck, but dilated on the lower part of the 

 cheeks; legs brownish black with a slight admixture of gray hairs, 

 excepting on the anterior edge of the hind thighs; and the lower 

 edgings of the toes, where the gray predominated; the tail was short, 

 fusiform, a little tinged with ferruginous, black above, near the base, 

 and at the tip; the top of the trunk hardly attaining the os calcis; the 

 longer hairs of the back, particularly over the shoulders, resembled 

 a short, sparse mane." The specimen figured by Richardson, Faun. 

 Bor. Am., 1829, p. 69, pi. 3, Mamm. , was killed at Fort Resolution, 

 Great Slave Lake, Lat. 61. 



Mfasurements. Total length, about 1.365; tail vertebrae, 273. 



