April, iqio. Fishes of Chicago — Meek and Hildebraxd. 307 



bb. Dorsal fin with more than ic spines, usually 11. 



Atnbloplites, 309 

 aa. Anal fin less than half the length of the dorsal, with 3 spines. 



c. Body short and deep, its depth about 2/5 its length; dorsal fin 

 not deeply divided; opercle prolonged in a bony process or 

 flap; its posterior margin rounded. 



d. Mouth large, the maxillary reaching past the pupil; supple- 

 mental maxillary large, its length nearly equal to diameter of 

 eye; tongue and pterygoids with teeth. Chcenobryttus , 310 



dd. Mouth smaller, the maxillary not reaching past pupil; supple- 

 mental maxillary small or wanting, its length never equal to 

 diameter of eye; no teeth on tongue or pterygoids. 



e. Opercular flap without roundish red spot on its lower posterior 

 angle; pectorals not reaching beyond vertical from first anal 

 spine; lower pharyngeals narrow, with pointed teeth. 



Lepomis, 311 

 ee. Opercular flap with a roundish red spot on its lower posterior 

 angle; pectorals reaching past first anal spine; lower phar- 

 yngeals broad, with bluntly rounded or paved teeth. 



Eupomotis, 314 

 cc. Body elongate, its depth about K its length; dorsal fin deeply 

 divided; opercle prolonged, ending in two points; mouth 

 large, maxillary reaching posterior margin of orbit. 



Micropterus, 315 



Genus Poiiioxin Rafinesque. 



Crappies. 



Body much compressed; dorsal region moderately elevated; 

 mouth large, its gape extending to or beyond pupil ; maxillary with 

 a well developed supplemental bone; teeth on jaws, vomer, palatines, 

 tongue, and pterygoids; opercle rounded; base of anal fin i to 1.4 in 

 base of dorsal; anal spines 5 to 8; dorsal spines fewer than 10; 

 preopercle and preorbital finely serrate; scales scarcely ctenoid; 

 caudal fin emarginate. 



a. Dorsal spines usually 6; a line from posterior end of maxillary 

 at right angles to margin of upper jaw passes in front of dorsal 

 fin. annularis, 308 



aa. Dorsal spines usually 7 or 8; a line from posterior end of 

 maxillary at right angles to margin of upper jaw passes 

 through dorsal fin. sparoides, 308 



