CYPEINID^. — cvm. 307 



brightly colored species allied to this occur farther 

 South. 



** Mouth terminal; teeth 3, 4—4, 2; size large; dorsal very 

 slightly behind ventrals. (Genus Cowsius, Jor.) 



7. 0. 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. Milneb's Chub. Depth 4|^ 

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

 broad snout vrhich projects over the large oblique 

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

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

 colors of Semotilics corporalis, but the fins unspotted. 

 Lake Superior. 



22. RH/lif/CHTHyS, 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. cataractcB, (C. & V.) Jor. Long - Nosed Dace. 

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

 the long snout; head 3f in length; D. I, 8; A. I, 7; 

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

 brooks. \Ii. Tiomitus^ (Ayres) Ag.J 



3. R. marmoratus, Ag. Marbled Dace. Brown, 

 marbled; eye 3^ 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. 

 \ 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 



