38 VERTEBRATE ANIMALS OF THE UNITED STATES 



C2 Body of male and many females covered with white 



tubercules; in Maine C. stanleyi. 



ho Upper jaw not reaching the eye C. quadrilateralis . 



a2 Species in the far-west. 



b; Adipose fin with a much shorter base than the anal. 



Ci Scales 63 in the lateral line C. coulter i. 



Co Scales 83 in the lateral line C. williamsoni. 



bo Adipose fin with as long a base as the anal C. oregonus. 



C. dupeaformis (Mitchill) (Fig. 18). Common whitefish. Length 

 600 mm. or more; greatest weight about 23 lbs.; head 4.5 to 5; depth 3.5 

 to 4; color olivaceous above; sides white; rays of dorsal fin 10 to 12; 

 anal 10 to 14; scales 72 to 86, usually over 75; branchiostegals 9 to 10; gill 

 rakers long and slender: Great Lakes and neighboring waters, and north- 

 ward to the Arctic Ocean; abundant; the most valuable food fish in the 

 Great Lakes. The whitefish feeds on small crustaceans and moUusks 



Fig. 18. — Coregonus dupeaformis {from Jordan c^ Evermann). 



and lives most of the year in deep water, but in the fall and early winter, 

 at spawning time, it approaches the shores. 



C. stanleyi Kendall. Length 230 mm.; head 4.5; depth 4.3; color 

 of back blue-black; sides and belly yellowish; body of male and of 

 many females covered with white tubercles; rays of dorsal fin 10; anal 

 1 1 ; scales 10-82-7 : lakes of Maine; abundant. 



C. quadrilateralis Richardson. Menominee whitefish; frostfish. 

 Length 300 mm.; head 5.5; depth 4.5; color dark bluish above; silvery 

 beneath; rays of dorsal fin 11; anal 12; scales 8-90-7; branchiostegals 8; 

 gill-rakers short and stout; body slender and elongate: the upper Great 

 Lakes and northward; lakes of the Adirondack region and of New 

 England; common. 



C. williamsoni Girard. Rocky Mountain whitefish. Length 400 

 mm.; head 4.5 to 5; depth 4 to 5; color bluish above; sides silvery; fins 



