SOME ANIMALS OF YUKON TERRITORY 305 



and probably the few sheep that cross this area, either 

 from the north or from the south, are scattered and driven 

 from their ranges. Sheep do not enter the humid belt 

 of the continuous Coast Ranges. 



That sheep do cross the barriers is proved by the fact 

 that occasionally one of intermediate color is found among 

 the white Dall sheep on the Watson River, and Dall sheep 

 are sometimes found among the variables near Big Horn 

 Creek, and even farther south. In the Watson River 

 country, some of the sheep are pure white with black tails, 

 a very few have gray hairs mingled in the back, but most 

 of them are pure white including the tails. Directly west 

 of the Watson River region west of longitude 136 de- 

 grees and south of latitude 62 degrees all the sheep are 

 pure white. 



Just north of latitude 62 degrees, near the head of the 

 Selwyn River, a few of the sheep have enough gray hairs 

 on the back to suggest the pattern area of coloration. I 

 have not been able to get many facts about the occurrence 

 of sheep between the Selwyn River and the Watson River. 

 Sheep, however, are known to cross the Thirty Mile 

 River (that part of the Lewes River between Lake Le 

 Barge and the mouth of the Teslin), and it is quite pos- 

 sible that some of the variables between the Teslin River 

 and the Lewes mingle among the sheep west of Thirty 

 Mile, and hence influence the colors northward to the 

 Selwyn River. Sheep do not cross the Yukon River 

 south of the vicinity of Eagle in Alaska. 



The natural route of uninterrupted sheep travel north- 

 ward from the Stikine River is directly through the Cas- 



