APRIL, 1910. FISHES OF CHICAGO MEEK AND HILDEBRAND. 311 



This species inhabits sluggish waters from the Great Lakes to 

 North Carolina and Texas. 



Jackson Park, Chicago, Illinois; Fox River, Bervvyn, Illinois; 

 Chicago River, Edgebrook, Illinois; Hickory Creek, Marley, Illinois; 

 Hickory Creek, New Lenox, Illinois. 



Genus Lepomis Rafinesque. 

 THE TRUE SUNFISHES. 



Body deep, compressed, the dorsal region elevated; mouth small, 

 its gape not reaching pupil ; maxillary with small supplemental bone 

 or none; teeth on jaws, vomer, and usually on palatines, none on 

 tongue or pterygoids; opercle rounded, ending in a bony or osseo- 

 membranous process or flap ; preopercle entire ; anal spines 3 ; 

 caudal fin emarginate. 



a. Moderately large; supplemental bone present; black spot on 

 opercle on its stiff bony portion. 



b. Maxillary about 2.3 in head; cheeks with wavy bluishgreen 

 lines. . cyanellus, 311 



bb. Maxillary about 2.7 in head; cheeks without wavy bluishgreen 

 lines. euryorus, 312 



aa. Mouth small; supplemental bone very small or wanting; black 

 spot of opercle on its thin flexible portion. 



c. Gill rakers short and weak, their length about 6 in eye; no 

 black spot on base of last rays of dorsal fin. megalotis, 313 



cc. Gill rakers longer, their length about 3 in eye; a black blotch 

 at base of last dorsal rays. incisor, 313 



Lepomis cyanellus Rafinesque. GREEN SUNFISH; BLUE-SPOTTED 



SUNFISH. 



Head 2.4 to 3.0; depth 2.1 to 2.5; D. ix or x, 10 to 12; A. in, 



9 or 10 ; scales 45 to 49. 



Body elongate, robust, moderately compressed; mouth moderate, 

 maxillary reaching to about middle of orbit ; supplemental bone well 

 developed; maxillary 2.0 to 2.5 in head; lower jaw the longer; eye 

 3.8 to 5.2 in head; snout 3.3 to 4.0; teeth present on vomer and pal- 

 atines; flexible margin of opercular flap fleshy, broader behind and 

 below than above; spinous dorsal low, its spines 3.0 to 4.2 in head; 

 pectorals short, rounded, 1.5 to 1.7 in head; scales on cheeks in 7 to 



10 rows; caudal fin emarginate; gill rakers long and stiff, the longest 

 2 in eye. 



