84 VERTEBRATE ANIMALS OF THE UNITED STATES 



with numerous dust-like tubercles and in the spring with red fins; 

 scales 5-36-3: basin of the Altamaha, Georgia; common. 



E. hyalinus (Cope). Silver chub. Length 75 mm.; head 4; 

 depth 5; color greenish, with a silvery lateral band; scales 5-38-4', rays 

 of anal fin 7 : New York to Iowa; southwards to Alabama; very common 

 in the Ohio Valley. 



E. storerianus (Kirtland). Length 250 mm.; head 4.3; depth 4; 

 color greenish, sides silvery; no red present; scales 6-40-4; body com- 

 pressed, the back elevated; eyes very large: Lake Erie to eastern 

 Wyoming; southwards to Tennessee and Nebraska. 



Fig. 38. — Nocomis bigullalus (from t'lshcs of Illinois). 



48. Nocomis Girard. Size large; mouth large, nearly terminal; 

 dorsal fin slightly behind the ventrals; eye small: i species. 



N. higuttatus (Kirtland). Horny-head; river chub; jerker (Fig. 38). 

 Length 250 mm.; head 4; depth 4.25; color bluish olive; sides with 

 greenish reflection; fins pale orange; a dusky bar behind the opercle; 

 males in the spring with a crimson spot on the side of the head; scales 

 6-41-5; adults with a swollen crest on the head: Pennsylvania to 

 Wyoming; southward to Alabama; very common in larger streams. 



49. Couesius Jordan. Body elongate ; mouth terminal ; a barbel on 

 each maxillary; teeth 2, 4-4, 2, hooked; scales small; rays of both dorsal 

 and anal fins 8: 4 species in the United States, i in Mexico. 



C plumheus (Agassiz). Length 150 mm.; head 4.5; depth 4.5; 

 color dusky; sides silvery, with a dark lateral band; free margin of the 

 dorsal fin concave; scales 11-60 to 70-7: Lake Superior to northern 

 New York and New Brunswick; very common northwards. 



C. dissimilis (Girard). Like C. plumbeus, but more robust; free 

 margin of dorsal fin nearly straight: upper Missouri and Black Hills 

 region. 



C. greeni Jord. Length 150 mm.; head 4; depth 4; color dark olive; 

 sides reddish silvery; a dark streak under the eyes; scales 10-57-7; body 

 robust; back convex: head waters of the Fraser River; Idaho. 



