294 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. VII. 



FIG. 54 STEELHEAD; SALMON TROUT. 



Salmo gairdneri Richardson. (After Goode.) 



A Pacific Coast fish introduced into the Great Lakes ; occasionally 

 taken at Pine and Millers, Indiana. 



Genus Cristivomer Gill & Jordan. 

 LAKE TROUT. 



Body moderately elongate; mouth large, hyoid with a band of 

 strong teeth; jaws with teeth; vomer boat-shaped, with a raised 

 crest behind its head and free from its shaft; crest of vomer with 

 teeth; scales small. 



Cristivomer namaycush (Walbaum).LAKE TROUT ;MACKIN AW TROUT. 



Head 3.8 to 4.2; depth 4 to 5.2; D. n; A. n; scales 185 to 210. 



Body elongate, head large, its upper surface flattened; interorbital 

 space 3.2 to 3.9 in head; snout 3.2 to 3.5; mouth large, the maxillary 

 reaching beyond eye; its length about half that of head; teeth very 

 strong; lateral line complete. 



Color grayish green to brownish, to almost black; sides with 

 round pale spots; head usually vermiculate above ; dorsal and caudal 

 reticulated with darker, the anal faintly so. 



Length 3 feet. 



This fish inhabits the colder lakes and streams of North America 

 from Alaska, Northern Illinois to Maine and northward. 



Lake Michigan, Millers, Indiana; Lake Michigan, Pine, Indiana. 



