264 Field Museum of Natural History — Zoology, Vol. VII. 



Opsopceodus emiiiae Hay. Small-mouthed Minnow. 



Head 4.2 to 4.5; depth 4.1 to 4.8; D. 8 org; A. 8; scales 38 to 40. 



Body elongate, moderately compressed; head small; mouth very 

 small and oblique, its gape making an angle of about 30 with vertical ; 

 maxillary 3.7 to 4.6 in head; snout 3.2 to 3.8; diameter of eye 3.1 to 

 3.7; teeth 5-5 or 4-5, slender and strongly hooked; alimentary canal 

 a little shorter than the body; peritoneum dusky to white; dorsal 

 fin inserted nearer tip of snout than base of caudal; lateral line in- 

 complete; scales not smaller on anterior part of body, 15 to 18 in series 

 before dorsal fin. 



Fig. 29. MOUTHED Minnow. 



Opsopsodus emilise Hay. (From Forbes and Richardson.) 



Color light olivaceous, scales conspicuously dark edged; a dark 

 lateral band ; no caudal spot ; dorsal fin with one or two dark blotches, 

 most conspicuous in breeding males, other fins plain. 



Length about 2% inches. 



A small fish ranging from Mississippi to Oklahoma to Northern 

 Illinois. 



Wolf Lake, Roby, Indiana, 



Genus Noteiiiiffoniis Rafinesque. 

 Breams. 

 Body deep, much compressed; edge of ventral surface in front of 

 ventral fins forming a keel over which the scales do not pass; pre- 

 maxillary protractile; mouth terminal, oblique; teeth 5-5, hooked 

 and with grinding surface; alimentary canal short; peritoneum pale; 

 scales 39 to 55; lateral line present, much decurved. 



Notemi)(onus crysoleucas (Mitchill). Golden Shiner; Roach; 



Bkkam. 



Head 4 to 4.5; depth 3.0 (adult) to 4.5 (young); D. 8; A. 11 to 

 14; scales 45 to 53. 



