April, 1910. Fishes of Chicago — Meek and Hildebrand. 327 



Genus Etlieostoiiia Rafinesque. • 



Body robust or elongate, considerably compressed; mouth large 

 or small, terminal or subinf erior ; premaxillaries not protractile; 

 teeth usually on vomer and palatines; ventral surface covered with 

 ordinary scales; gill membranes connected or not; pyloric caeca 3 

 or 4. 



a. Lateral line usually complete, pores occasionally lacking on 2 

 to 6 scales; gill membranes broadly connected, zonale, 327 



aa. Lateral line incomplete, pores usually lacking on 10 or more 

 scales. 



b. Gill membranes scarcely connected; lower jaw moderate, not 

 projecting. 



c. Cheeks and opercles with scales. 



d. Body slender, little compressed, its depth 5.4 to 6.8; soft 

 dorsal with 9 to 11 rays; scales 55 to 60 in lateral series; sides 

 without crossbars. iowcB, 328 



dd. Body compressed, its depth 4.8 to 5.4; soft dorsal with 12 to 

 13 rays; scales 49 to 57 in lateral series; sides with brown 

 crossbars. Jessies, 328 



cc. Cheeks naked, opercles with scales; body compressed, its 

 depth 4.7 to 5.0; soft dorsal with 12 to 14 rays; scales 44 to 51 

 in lateral series; sides with crossbars, these red and blue in 

 spring males. cceruleum, 329 



bb. Gill membranes broadly connected; lower jaw strongly pro- 

 jecting, fiabellare, 330 



Etheostoma zonale (Cope). Banded Darter. 



Head 4.0 to 4.9; depth 4.7 to 6.0; D. x or xi — 10 to 12; A. 11, 7 

 or 8; scales 46 to 53. 



Body robust, Httle compressed; head short with decurved snout; 

 interorbital space convex; mouth small, its gape horizontal, its cleft 



Fig. 72. Banded Darter. 

 Etheostoma zonale (Cope). (From Forbes and Richardson.) 



