1902.] THE UPPER ILI AND YANA VALLEYS. 85 



Bighorn, perfectly distinct from the Kamchatkan representative 

 of that gi'oup. 



Compared with the Kamchatkan Bighorn, the Wild Sheep of 

 the Yana is essentially the same type of animal ; although its 

 general coloration is decidedly lighter, thei'e is a much greater 

 projDOi'tion of white, and the dorsal streak and tail are much 

 darkei'. 



The Kamchatkan Bighorn may be roughly described as a nearly 

 uniform grey-fawn animal, with a compai-atively small white 

 rump-patch, a certain amount of white on the muzzle, postero- 

 internal sides of limbs, and under-parts, and a brown tail, which 

 is remarakably short and broad. In the male of the Yana Sheep 

 the white rumjj-patch is much larger, although it does not include 

 the short and bushy tail, or extend on the buttocks above its line 

 of origin. The face, too, is white, with the exception of a wood- 

 brown transverse band midway between the nostiils and the eyes, 

 which expands out to include each cheek. The whole nape is 

 also white mingled with gi'ey. An indistinct dark line runs down 

 the back and becomes more distinct as it approaches the tail, 

 which is blackish brown. There is also a larger proportion of 

 white on the legs and under-parts. An impoi'tant difference fi'om 

 0. nivicola is to be found in the markedly laiger ears, which ai'e 

 very thickly haired. 



A female head, brought by Mi-. Clifton, is wholly greyish white, 

 passing into pure white on the forehead and muzzle. 



The skull pi'esents all the features distinctive of that of the 

 Kamchatkan Bighorn. 



There can, I think, be no question but that the Yana Sheep is 

 nothing more than a local race of the Kamchatkan Bighorn, And, 

 although these two animals diflier more from all the American 

 Bighorns than do the latter from one another, I am of opinion 

 that it is advisable to regard the whole gioup as local phases of 

 a single variable type. If this view be accepted, the scientific 

 name of the Sibei-ian Bighorn will be Ovis canadensis horealis. 

 So far as I know, no English name has been suggested for 

 this sheep, which, I think, may be colloquially designated 

 Clifton's Bighorn. 



EXPLANATION OF THE PLATES. 

 PlATE VIL 



Fig. 1. Head of Littledale's Hi Sheep {Ovis sairensis littledalei), from the type 

 specimen in the British Museum. 

 2. Head of Littledale's Saiar Sheep {Ovis sairensis), from the type specimen in 

 the British Museum. 

 Both figures one-fourth nat. size. 



Plate VIII. 



Clifton's Bighorn {Ovis canadensis horealis), from the ram brought by Mr. J. 

 Talbot Clifton from the Yana Valley. 



