FISHES 47 



T. whitei Evermann. Golden trout. Similar to T. roosevelti; 

 back and sides profusely spotted; scales larger; lower fins yellowish; 

 no red on throat : in the western tributaries of the Kern River, California. 



T. sniaragda Snyder. Greenback. Form slender; scales 124; color 

 green above: Pyramid Lake region, Nevada. 



T. aquilarum Snyder. Length 480 mm.; head 4.2; depth 4.2; 

 scales 136; color dark olive above; below the lateral line and on belly 

 coppery red; a trace of red on the throat; profusely spotted above 

 the lateral line: Eagle Lake, California. 



4. Cristivomer Gill & Jordan. Great Lakes trout. Body of large 

 size, spotted with gray; scales very small; vomer elongate, with a raised 



Fig. 23. — Cristivomer namaycush {from Jordan b' Evermann' s Salmonoid Fishes of the Great 



Lakes). 



median crest armed with strong teeth; hyoid with a broad band of 

 strong teeth: 2 species, which are the largest of the trouts. 



C. namaycush (Walbaum). Mackinaw trout; lake trout (Fig. 23). 

 Length 900 mm.; head 4.5; depth 4; average weight 16 lbs.; extreme 

 weight 90 lbs.; color dark gray, often greenish on the sides, every- 

 where with rounded paler spots which are often tinged with reddish; 

 rays of dorsal fin 11; anal 11; scales 185 to 205; body elongate; head 

 very long; mouth large: northern North America from Maine to Van- 

 couver and northward to the Arctic and Alaska; common in the Great 

 Lakes, where after the sturgeon, it is the largest fish, and, after the 

 whitefish, the most important fish commercially. 



C. siscowel (Agassiz). Similar to C namaycush, but with a deeper 

 body and an excessive development of fatty tissue beneath the skin; 

 color paler; scales 175: Lake Superior; abundant in deeper water; also 

 in Lakes Huron and Erie. 



5. Salvelinus Nilsson. Brook trout. Body moderately elongate, 

 spotted with red; scales very small and imbedded and hidden; vomer 

 elongate, with teeth on front end only, hinder portion depressed and 

 without teeth; hyoid with weak teeth or none: many species, which live 



