320 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. VII. 



Genus Perca (Artedi). Linnaeus. 



YELLOW PERCH. 



Body elongate, considerably compressed; head large; mouth 

 moderate; premaxillary protractile; preopercle serrate; opercle 

 with a single spine; teeth in villiform bands on jaws; vonier and 

 palatines; no canines; pseudobranchiae small; pyloric coeca 3 to 7. 



Perca flavescens (Mitchill). YELLOW PERCH. 



Head 3.0 to 3.5; depth 3.3 to 3.8; D. xn to xiv n or in, 12 or 

 13; A. n, 7 or 8; scales 57 to 62. 



Body moderately elongate, compressed; head large, pointed; 

 interorbital space nearly flat; mouth large, the maxillary reaching 

 middle of orbit; snout pointed 3.4 to 3.7 in head; diameter of eye 

 3.6 to 4.8; preopercle strongly serrate; opercle ending in several 

 points; spinous and soft dorsal separate; cheeks scaled in about 8 

 to 10 rows; gill rakers x+i5; pyloric coeca 3; lateral line complete 

 or nearly so. 



Color brassy green to golden yellow; sides with 7 dark or dusky 

 bars; spinous dorsal gray, usually with a black spot on last 2 mem- 

 branes; soft dorsal and caudal pale-green. 



Length i foot. 



This fish ranges from North Dakota to Nova Scotia, New York, 

 and Iowa. 



Fox River, McHenry, Illinois; Lake Michigan, Chicago, Illinois; 

 Calumet Lake, Pullman, Illinois; Hickory Creek, New Lenox, Illi- 

 nois; Wolf Lake, Roby, Indiana; Lake Michigan and Lagoons, 

 Millers, Indiana; Lagoon, Buffington, Indiana; Lake Michigan and 

 Lagoons, Pine, Indiana; Calumet River, Clark, Indiana; Lake Mich- 

 igan and Lagoons, Edgemoor, Indiana. 



Genus Perciiia Haldeman. 



Body elongate, scarcely compressed; premaxillary not protrac- 

 tile ; teeth on vomer and palatines ; mouth small and inferior ; pyloric 

 cceca 6; ventral surface with a row of enlarged scale-like caducous 

 plates. 



Percina caprodes (Rafinesque). LOG-PERCH. 



Head 3.6 to 4.8; depth 5.4 to 7.0; D. xn-i5; A. n, roor n; scales 

 83 to 93. 



