Rio Grande Trout 



forms are in any way identical. Out of a large number of trout 

 caught by me in Lake Southerland only 2 or 3 of this form were 

 procured, and they were all of small size. This could not be 

 the fault of the lake, which is exceedingly deep and nearly 3 

 miles in length. It is a gamy fish, takes the fly, leaps out of the 

 water, and is a good fighter for its size." It reaches a length of 

 10 inches. 



Rio Grande Trout 



Salmo spilnrus (Cope) 



This trout is known only from the upper Rio Grande basin 

 and southward into the mountains of Chihuahua. It is abundant 

 in most mountain streams, but irrigation operations in Colorado 

 and New Mexico have proved very destructive to it on account 

 of the small fish running up the ditches and out upon the fields 

 where they perish. Del Norte and Wagonwheel Gap, Colorado, 

 used- to afford excellent trout fishing. The trout were abundant, 

 of good size (2 to 2\ feet), and were very gamy. 



Head 3^; depth 4; D. n; A. 10; scales 37-160-37. Head 

 rather short, its upper surface considerably decurved; interorbital 

 space transversely convex, obtusely carinated, the head more 

 convex than in any other species; mouth large, maxillary reaching 

 past eye; teeth on vomer in 2 distinct series; dorsal fin low in 

 front, high behind, the last ray more than f height of first; last 

 ray of anal rather long; caudal witi. its middle rays about as 

 long as the others. Colour, back ana sides profusely covered 

 with round black spots, most developed posteriorly, few on the 



185 



