SAlyMONOID FISHES OF THE GREAT LAKES. 
41 
Coregonus williamsoni Girard. Rocky Mountain Whitefish. 
Coregonus williamsoni Girard, Proc. Ac. Nat. Sci. Phila. 1856, p. 136, Des Chutes River, Oregon. 
Habitat: Rivers of the Sierra Nevada and west slope of the Rocky Mountains, from the Fraser 
and the Columbia to the Truckee and other streams of the Lahontan basin of Nevada; abundant 
especially in lakes of northern Idaho, western Montana, and Washington. One of the most delicious 
of food fishes, and reaching a weight of 4 pounds. 
Coregonus cismontanus Jordan. Y ellow stone Whitefish. 
Coregonus williamsoni cismontanus Jordan, Bull. U. S. Fish Comm., vol. ix, 1889, p. 49, pi. 9, fig. 8, 9, Horsethief 
Creek, Madison River, Montana: coll., E. R. Lucas. 
Habitat: Streams of the Rocky Mountain region tributary to the upper Missouri. 
It is very doubtful if this fish differs at all from Coregonus williamsoni which replaces it on the 
west side of the Rock Mountains. 
Fig. 23. — Coregonus oregonius Jordan & Snyder. Oregon V/hitefish. From the type. 
Coregonus coulteri Eigenmann & Eigenmann. Coulter' s Whitefish. 
Coregonus coulterii Eigenmann & Eigenmann, Amer. Nat., Nov., 1892, p. 961, Kicking Horse River at Field, British 
Columbia. 
Habitat: Headwaters of the Columbia. 
A strongly marked species easily recognized by its large scales (60 to 63). 
Coregonus eouesi Milner. 
Coregonus couesii Milner, Rept. U. S. Fish Comm, for 1872-73 (1874), p. 88, Chief Mountain Lake, Montana; 
coll., Elliott Coues. 
Habitat : Headwaters of Saskatchewan River. 
This is a strongly marked species, allied to Coregonus oregonius, and very improperly confounded 
with Coregonus williamsoni by Jordan & Evermann. 
Coregonus oregonius Jordan & Snyder. Chisel-mouth Jack; Oregon Whitefish. 
Coregonus oregonius Jordan & Snyder, Proc. U. S. Nat. Mus., vol. xxxvi, 1909, p. 425, with fig., Mackenzie 
River, Oregon. 
Habitat: Lower Columbia River basin. 
A well-marked species, agreeing with C. eouesi in the long snout, and further distinguished by 
the very high adipose fin. 
