APRIL, 1910. FISHES OF CHICAGO MEEK AND HILDEBRAND. 281 



Genus Rhiiiichtliys Agassiz. 



Body elongate, little compressed; mouth small, inferior, a small 

 barbel at tip of maxillary; premaxillary not protractile; teeth i or 2, 

 4-4, i or 2, hooked and without grinding surface; alimentary canal 

 short; peritoneum dusky; scales small, 60 to 70 in lateral series, 

 a. Snout long, projecting far beyond the inferior mouth. 



cataracta, 281 



aa. Snout shorter, not projecting far beyond the subinferior mouth. 



atronasus, 281 



Rhinichthys cataractse (Cuvier & Valenciennes) . LONG-NOSED DACE. 



Head 4.0 to 4.1; depth 4.8 to 5.2; D. 8; A. 7 ; scales 63 to 70. 



Body elongate, scarcely compressed; head long, the snout over- 

 hanging the mouth; mouth small, inferior, tip of the upper lip on 

 level with point half way between orbit and chin; maxillary 2.9 to 



FIG. 46. LONG-NOSED DACE. 



Rhinichthys cataractas (C. and V.). (From Forbes and Richardson.) 



3.1 in head; lower jaw much shorter than the upper; snout 2.2 to 

 2.5 in head; diameter of eye 4.8 to 5.6; teeth 2.4-4.2; dorsal fin be- 

 hind ventrals, much nearer base of caudal than tip of snout. 



Color olivaceous above, paler below; sides with dark blotches; 

 an indistinct dark lateral band; a black spot on opercle. 



Length about 2% inches. 



This species ranges from Wisconsin to New England and Virginia. 



Rhinichthys atronasus (Mitchill). BLACK-NOSED DACE. 



Head 3.6 to 4.2; depth 4.5 to 5.0; D. 8; A. 7 to 8; scales 62 to 71. 



Body elongate, scarcely compressed; head long, wider than deep; 

 mouth small, subterminal, slightly oblique; tip of upper' lip on level 

 with lower margin of orbit ; maxillary scarcely reaching past anterior 

 nostril, its length 3.3 to 4.0 in head; snout long, 2.7 to 3.0 in head; 

 teeth 2, 4-4, 2 ; dorsal fin behind ventrals, nearer base of caudal than 

 tip of snout; lateral line complete. 



Color dusky to blackish above; the back and sides mottled with 



