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



Opsopoeodus emiiiae Hay. Small-mouthed Minnow. 



Head 4.2 to 4.5; depth 4.1 to 4.8; D. Sorg; 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. Small-mouthed Minnow. 



OpsopT?odus emilije 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 2X inches. 



A small fish ranging from Mississippi to Oklahoma to Northern 

 Illinois. 



Wolf Lake, Robv, Indiana. 



Genus Noteinig'onvis 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; aliinentary canal short; peritoneum pale; 

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



Notemigonus crysoleucas (Mitchill). Golden Shiner; Roach; 



Bream. 



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

 14; scales 45 to 52. 



