APRIL, IQIO. FISHES OF CHICAGO MEEK AND HILDEBRAND. 307 



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



Ambloplites, 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. Ch&nobryttus , 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 % its length; dorsal fin deeply 

 divided; opercle prolonged, ending in two points; mouth 

 large, maxillary reaching posterior margin of orbit. 



Micropterus, 315 



Genus Pomoxis 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 



