CYPBINID^. GVIII. 307 



brightly colored species allied to this occur farther 

 South. 



** Mouth terminal ; teeth 2, 44, 2 ; size large ; dorsal very 

 slightly behind ventruls. (Genus Couesius, Jor.) 



7. C. prosthemius, Cope. LAKE CHUB. Depth 5 

 in length, equal to length of head; eye 4 in head; 

 snout blunt; mouth small; dusky above, sides plumbeous; 

 lat. 1. 63; L. 6 to 7. Great Lakes. 



8. C. milneri, Jordan. MILXER'S CHUB. Depth 4^- 

 in length, equal to head; head flattish above, with a 

 broad snout which projects over the large oblique 

 mouth; barbel well developed; eye large, 3J in head; 

 D. I, 8; A. I, 8; lat. 1. 68; scales crowded forwards; 

 colors of Semotilus corporalis, but the fins unspotted. 

 Lake Superior. 



22. RHINICHTHYS, Agassiz. LONG- NOSED DACE. 

 = Argyreus, Heckel (preoccupied.) 



* Snout projecting considerably beyond the mouth ; body slender, 

 depth usually 5 to 6 in length ; barbels evident. 



1. R. cataractce, (C. & V.) Jor. LONG - NOSED DACE. 

 Brownish, mottled, not banded; eye half the length of 

 the long snout; head 34 in length; D. I, 8; A. I. 7; 

 lat. 1. 63; L. 5. New England to Va, and Wis., in clear 

 brooks. [R. nasutus, (Ayres) Ag.] 



2. R. marmoratus, Ag. MARBLED DACE. Brown, 



marbled; eye 2^ in snout; head 4^ in length; lat. 1. 70. 

 Great Lakes. (Doubtfully distinct.) 



** Snout scarcely projecting; body stout; depth 4 to 5 in length; 



barbels scarcely visible, 

 f A distinct dark band from snout to caudal (red in spring.) 



3. R. atronasus, (Mitch.) Ag. BLACK- NOSED DACE. 

 Dusky, belly silvery} lateral band bright crimson in 



