AiPRiL, 1910. Fishes of Chicago — Meek axd Hildebrand. 321 



Body elongate, cylindrical; head long and pointed; interorbital 

 area flat or slightly concave; mouth small, overhung by the pig-like 

 snout ; maxillary scarcely reaching to posterior nostril ; cleft of mouth 

 3.4 to 4.0 in head; snout long, conical, 2.8 to 3.3 in head; eye high on 

 head, 3.6 to 4.2 in head; spinous and soft dorsals very little separated ; 



Fig. 66. Loo Perch. 



* Percina caprodes (Raf.). (After Forbes and Richardaon.) 



separation of ventrals about equal to their width at base; cheeks and 

 opercles covered with scales; nape usually fully scaled; breast naked. 



Color olive-buff to yellowish; sides of adults with 30 to 40 dark 

 bars, alternate ones are half bars, these are usually absent in young; 

 a small black caudal spot; dorsal and caudal fins barred, other fins 

 plain. 



Length 4 to 6 inches. 



This fish ranges from the Great Lake Drainage to Alabama and 

 Texas. 



Fox River, McHenry, Illinois; Des Plaines River, Berwyn, Illinois; 

 Wolf Lake, Roby, Indiana; Lake Michigan, Pine, Indiana; Lake 

 Michigan, Edgemoor, Indiana. 



Genus Haclropteriis Agassiz. 



BLACK-giDED Darters. 



Body rather elongate, slightly compressed ; premaxillary not pro- 

 tractile; teeth on vomer and usually on palatines; mouth rather 

 large, terminal; pyloric coeca 2 to 4; ventral surface with a row of 

 enlarged scales, caducous in some species, persistent in others; gill 

 membranes united to the isthmus. 



liadropterus aspro (Cope and Jordan). Black-sided Darter. 



Head 3.8 to 4.0; depth 5.4 to 6.8; D. xiii to xv — 11 to 14; A. 11, 

 8 to n ; scales 50 to 56. 



