Salmonidae 



105 



and large black spots. This is Salmo clarkii stomias, and it is 

 especially fine in St. Vrain's River and the streams of Estes Park. 



FIG. 67. Green-back Trout, Salmo stomias Cope. Arkansas River, Leadville, Colo. 



In Twin Lakes, a pair of glacial lakes tributary of the Arkansas 

 near Leadville, is found Salmo clarkii macdonaldi, the yellow- 

 finned trout, a large and very handsome species living in deep 

 water, and with the fins golden yellow. This approaches the 

 Colorado trout, Salmo clarkii pleuriticus, and it may be derived 



FIG. 08. Yellow-fin Trout of Twin Lakes, Salmo macdonaldi Jordan & Evermann. 



Twin Lakes, Colo. 



from the latter, although it occurs in the same waters as the 

 very different green-back trout, or Salmo clarkii stomias. 



Two fine trout derived from Salmo clarkii have been lately 

 discovered by Dr. Daniel G. Elliot in Lake Southerland, a moun- 

 tain lake near Lake Crescent, but not connected with it, the 

 two separated from the sea by high waterfalls. These have 

 been described by Dr. Seth E. Meek as Salmo jordani, the 

 "spotted trout" of Lake Southerland, and Salmo dedivifrons, 

 the "salmon-trout." These seem to be distinct forms or sub- 

 species produced through isolation. 



