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, 

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

 Indiana; Calumet River, Clark, Indiana. 



Genus Aliibloplites 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 xii, 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; 

 6y6 35 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; 

 Hickorv Creek, New Lenox, Illinois. 



