CYPRiNiD^Ji:. — cviir. 289 



2. H. supsrci/iosus, Cope. Head broader; a distinct 

 barbel at each angle of the mouth; scales on sides high 

 and narrow. With the preceding, of which it is perha^js 

 a variety. 



4. COLISCUS, Cope. Coliscus. 



1. C. parietal is, Cope. Silvery; D. I, 7; A. I, 8; lat. 

 i. 42. Missouri. 



5. HYBOGNATHUS, Agassiz. Blunt- Jaaved Minnows. 



1. H. nuchalis, Ao-. Blunt -Jawed Minnow. Sub- 

 orbital bones broad and short, not long and narrow as 

 in the next; head 4|- in length; eye small, shorter than 

 snout, 4 to 4-|- in head; depth 4^ in length, about equal 

 to length of head; D. I, 8; A. I, 8; lat. 1. 38; L. 2^. 

 Ohio Valley and W. This and the next may be readily 

 known from the Hyhopses^ which they strongly resemble 

 externally, by the peculiarities of the intestines. 



2. H. argyr fis, Grd. Silvery Minnow. Olivaceous 

 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 S. C. 

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

 streams; one of our handsomest dace. [IT. osmerinus^ 

 Cope, not in the least different.) 



3. H. regius, Grd. Royal Minnow. Head 5 in 

 length; mouth small; bright silvery; D. 1, 9; A. I, 9; 

 L. 7; lat. 1. 38. Maryland and Virginia; a species 

 similar to the preceding but apparently much larger; 

 the two need further comparison. 



