136 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



in shape; under parts white and but little spotted. [See description in 

 detail beyond.] Anal-fin spotted, pied chin, patches on the cerato-hyals. 



Fig. Plate Ixxiii, Pacific Eailroad Eeports, vol. x. (Part embracing 

 Lieutenant Beckwith's Export.) 



Hab. — Southern Eocky Mountains, Utah, New Mexico. 



DiAGrNOSis : From Salmo lewisL See text relating to the latter species. 

 From *S^. iridea it may be distinguished by its usnally smaller head, the 

 absence of dark spots on the top of the head, the profusion of which in 

 that situation in >S^. iridea being a notable feature of the species ; the 

 sparsely scattered, large, round, black spots on the anterior portion of 

 the body; their distiuctuess and regular shape distinguishes them from 

 the more numerous spots of the latter species. The tail of this species 

 in the adult is nearly even at its fore margin; that of an adult 8. iridea 

 is well forked. 



A trout sent from Santa Fe, K. M., preserved in the Smithsonian col- 

 lection, shows slight variations from those received from Northern New 

 Mexico, Utah, und Nebraska. It agrees with the 8. virgiiialis in many 

 characters; in fact, in all essential points, such as the dorsal profile, 

 size of head compared to body, &c., &c., and in general plan of colora- 

 tion. It is, however, a brighter or more silvery-looking fishj its dark 

 spots smaller and less numerous. 



Dr. Girard first described this species from a young trout sent from 

 Utah Creek, a tributary of the Eio del Norte, by Lieutenaut Beckwith. 



A variety of the Sahno virginalis occurs in Lake Utah, a large sheet 

 of fresh water about fifty miles south of Salt Lake City. The fish are less 

 spotted than those caught in the mountain streams near by, and attain 

 a much larger size. They ascend the Timpanagos Eiver for spawning 

 purposes; at the proper thne, according to the accounts of the Mormons, 

 leaving the lake simultaneously in great numbers. They are said to be 

 occasionally seen a yard in length. A friend — Lieutenaut Williams, of 

 the United States Army, caught one of this kind in the Timpanagos, 

 about seven miles from the lake, which weighed seven pounds. I myself 

 have caught smaller fish in the same stream, which varied considerably 

 from those caught on the eastern side of Bear Mountains. 



In the Smithsonian collection two fish, obtained by Captain Simpson, 

 United States Army, seem to be of that variety. They are simply labeled 

 as from Utah, and appear to have been salted and diied before being- 

 thrown into alcohol. 



For this variety or kind we will, for the present, apply the provisional 

 name of Balmo Utah. 



Characters. — Highest point of convexity of dorsal profile rather 

 anterior to the same on 8. virginalis ; scales appear somewhat larger, (but 

 this may be more apparent than real, owing to the insufficieht material 

 for comparison;) appearances of fish more silvery, spots much smaller 

 in size and more irregular in shape; iu other respects resembling 8. 

 virginalis. 



