APRIL, 1910. FISHES OF CHICAGO MEEK AND HILDEBRAND. 309 



Color olivaceous above, silvery or yellowish below; body spotted 

 or mottled with dark greenish or blackish; anal fin much mottled 

 with darker. 



Length 12 inches. 



This fish inhabits the coastwise streams from New Jersey to Texas 

 and the Great Lakes. 



Lagoon, Jackson Park, Chicago, Illinois; Calumet Lake, Pullman, 

 Illinois; Hickory Creek, New Lenox, Illinois; Wolf Lake, Roby, 

 Indiana; Calumet River, Clark, Indiana. 



Genus Ambloplites Rafinesque. 



ROCK BASS. 



Body oblong, compressed; dorsal region elevated; mouth large, 

 its gape extending to pupil; maxillary with well developed supple- 

 mental bone; teeth on jaws, vomer, palatines, tongue, and pterygoids; 

 opercle ending in 2 flat points ; preopercle serrate at its angle ; anal 

 spines usually 5 ; branchiostegals 6 rarely 7 ; caudal fin slightly forked. 



Ambloplites rupestris (Rafinesque). ROCK BASS; GOGGLE-EYE; 



RED-EYE. 



Head 2.6 to 2.8; depth 2.2 to 2.5; D. xi or xn, 10 to 12 ; A. vi, 10 

 or ii ; scales 39 to 43. 



Body oblong, compressed; dorsal region elevated; mouth large, 

 maxillary reaching to middle of pupil, its length 2.1 to 2.4 in head; 

 e Y e 3-5 to 4.0: snout 3.4 to 4.1; pectorals reaching first anal spine, 

 1.8 to 2.0 in head; opercle ending in 2 flat points. 



Color olivaceous with black mottlings and brassy reflections ; each 

 scale on sides with black squarish spot, these forming broken lines 

 along the rows of scales; median fins with brown mottlings and faint 

 edgings of black ; a dark opercular spot . 



Length 8 to 10 inches. 



This species inhabits clear water from Vermont to Manitoba and 

 southward in the Mississippi Valley to Louisiana. 



Fox River, McHenry, Illinois; Des Plaines River, Chicago, Illi- 

 nois; Des Plaines River, Berwyn, Illinois; Salt Creek, Lyons, Illinois; 

 Hickory Creek, New Lenox, Illinois. 



