106 Salmonidz 
The Rio Grande trout (Salmo clarkii spilurus) is a large and 
profusely spotted trout, found in the head-waters of the Rio 
8 
Fiq, 69.—Rio Grande Trout, Salmo clarkii spilurus Cope. Del Norte, Colo. 
Grande, the mountain streams of the Great Basin of Utah, and 
as far south as the northern part of Chihuahua. Its scales are 
still smaller than those of the ordinary cutthroat-trout, and the 
black spots are chiefly confined to the tail. Closely related to 
Fic. 70.—Colorado River Trout, Salmo clarkii pleuriticus Cope. 
Trapper’s Lake, Colo. 
it is the trout of the Colorado Basin, Salmo clarkit pleuriticus, 
a large and handsome trout with very small scales, much sought 
by anglers in western Colorado, and abounding in all suitable 
streams throughout the Colorado Basin. 
Hucho, the Huchen.— The genus Hucho has been framed 
for the Huchen or Rothfisch (Hucho hucho) of the Danube, a 
very large trout, differing from the genus Salmo in having no 
teeth on the shaft of the vomer, and from the Salvelini at least 
in form and coloration. The huchen is a long and slender, 
somewhat pike-like fish, with depressed snout and strong teeth. 
