G<nl. Char. Similar apparently to O. stonei but paler. 



Color. Above pale, dingy lirown: caudal disk, posterior part of 

 belly, inner side of thighs, and himl part of legs, white: rest of uniier- 

 parts and legs dark brown. 



.\feasuremenls. Total length, i2So;tail vertebra-, loo: hind foot, 

 360: height at shoulder, 830. 



67. stonei. ( (^,-/V), Allen, Bull. Am. Mus. Nat. Hist., iSyj, p. in, 

 pts. I, 2. 



liardensis, Lydekker. Wild O.xen. Sheep and Goats, iSyS, p. J13. 



Type localilx. Che-onnee Mountains, Coast Range, British 

 Northwest Territory. 



Geogr. Dislr. From Cassiar Mountains 61=' north latitude, and 

 south to the head waters of the Nelson and Peace Rivers, Rocky 

 Mountains; west to longitude 134'. Also found in the Stickeen, 

 Cheonnees and Etsezas Mountains, Alaska. 



Gcnl. Char. Color, dark gray or blackish brown: horns slender, 

 curving outwards at tips. 



Color. Above blackish brown and whitish mi.xed: a broad black- 

 ish stripe from occiput to base of tail: face and sides of neck paler; 

 front of neck, chest and sides almost black: caudal disk, back of 

 thighs and underparts to center of chest, where it ends in a point, and 

 back of legs white: outside of legs blackish brown. Tail black, some 

 white hairs on lower surface; hoofs black: horns pale brown. 



yfeasurements. Total length, 1676; tail vertebr;e, 89: nose to 

 base of ear, 305. 



Horns. Length over curve. 762: tip to tip. 352; circumference 

 at base, 324. (Mounted specimen.) 



68. Aa\\\. {Oris), Nelson, Proc. U. S. Nat. Mus.. 1884. p. 12. 



I'ype locality. Fort Reliance, Upper Yukon River. 



Geogr. Distr. "Alaskan Mountains and the Kenai Peninsula: 

 Rocky Mountains north of latitude 60', to near the .\rctic coast west 

 of the Mackenzie, ranging thence west to the headwaters of the 

 Noatak and Kowak Rivers, that flow into Ko.zebiie Sound." (.X. J. 

 Stone. ) 



Genl. Char. White or yellowish white at all seasons. 



Color. Entirely whitish, hairs usually tipped with rusty. Some- 

 times specimens have certain parts brow-nisli, but this does not seem 

 to be confined to any particular spot. 



Measurements. Male. Total length, 1476; tail, 102; height at 

 shoulder, 991; length of tarsus, 419. 



Horns. Length along curve, 375-990: circumference at base, 

 219-368. 



