FISHES OF THE NORTHWEST. 35 I 



the Sevier River they have been taken in August with grass- 

 hoppers. These were very much smaller than those from 

 • Provo. The largest specimen seen measured eighteen inches 

 in length. 



Another species of Coregonus is the C. quadrilateirah, from 

 the upper great lakes of British America ; and there are still two 

 others that have been recently taken, the first from Chief Mountain 

 Lake, and other waters on both sides of the Rocky Mountains, 

 called by Prof. Milner C. couesii, the other caught by Mr. Henshaw 

 at Lake Tahoe, which Prof. Gill calls C. monianus. As it did not 

 take the hook at the time of Mr. Henshav/'s visit, we can give no 

 information as to the bait. The Indians, however, take large 

 numbers in nets. 



CouEs' Whitefish.— Rocky Mountain Whitefish.— C couesii. Milner. 



This fish is very common in the Yellowstone, Montana, and 

 Little Blackfoot Rivers, on the west side of the Rocky Mountains, 

 where they exceed four pounds in weight, and afford much sport 

 to the angler. They are very often taken with the fly, while fish- 

 ing for trout. They are also taken in Chief Mountain Lake, on 

 the eastern edge of the mountains. 



The most marked feature is the extensive prolongation of the 

 snout which protrudes far beyond the opening of the mouth. The 

 head narrows regularly toward the anterior of the frontals, where 

 two strong angles are found narrowing the head abruptly at the 

 point where the short supraorbitals join, and the frontals and 

 nasals continue forward in a narrow blade-like extension. The 

 adipose fin is large, attached to the body almost to the posterior 

 extremity, and is ensheathed in scales for a considerable distance 

 from the dorsal line. The greatest height of body is equal to the 

 length of the snout. 



CYPRINID^. 



'&\szvi-E.ns.—Catostomida. 



These fish, although not taking the hook readily, can be se- 

 cured with nets, spears, and such net-baskets as the Indians make 

 use of. 



