CYPRINID.E. CVIII. 277 



green above, sides clear silvery with bright reflections; 

 fins unspotted; eye large, longer than muzzle, 3 to 4 in 

 head; depth 4^ in length; scales in front of dorsal quite 

 large; lateral line decurved; head large, upper jaw 

 heavy; D. I, 8; A. I, 8; lat. 1. 38; L. 5. N. J. to N. C. 

 and W. to the Upper Missouri; abundant in the larger 

 streams; one of our handsomest dace. (H. osmerinus^ 

 Cope, not in the least different!) 



6. ER ICY MB A, Cope. ERICYMBAS. 



1. E. buccata, Cope. SILVER - MOUTHED DACE. 

 Elongated; depth nearly 5 in length; head 4; eye 

 large, 3 in head; olivaceous above, sides brilliantly 

 silvery, a narrow vertebral line, and a lateral chain of 

 brown dots; upper jaw rather large, its profile angukted; 

 mucous channels in lower jaw very conspicuous; D. I, 8; 

 A. I, 8; lat. 1. 33; L. 5. Ohio Valley, Penn. to Tenn. 

 (Jordan] and Illinois, abundant. A beautiful little fish 

 singularly distinguished from all our other species by 

 the cavernous bones of the head. 



7. SEMOTILUS, Rafinesque. FALL FISH. 



* Scales moderate, crowded forwards, 55 or more in lateral line; 

 a black spot at base of dorsal in front. (Semotilus.) 



1. S. corpora/is, (Mitch.) Putnam. COMMON CHUB.. 

 HORNED DACE. Body stout, depth 4^ in length; head 

 large, 3f ; dusky above, especially along edges of scales; 

 sides bluish, a black lateral band in young; silvery 

 below, sides and fins flushed with crimson in spring; 

 D. I, 8; A. I, 8; lat. 1. 55 to 65; L. 10 to 12. New 

 England (Housatonic R., Jordan) to the Missouri region 

 and S.; the most widely diffused of our Cyprinidce, 

 excepting Ceratichthys melanotus. It may be known 

 under all circumstances by the large head and the 



