APRIL, 1910. FISHES OF CHICAGO MEEK AND HILDEBRAND. 305 



Genus Labidesthes Cope. 



Body elongate, compressed; head oblong; mouth small, oblique, 

 the cleft curved, the jaws prolonged into a short depressed beak; 

 lower jaw the longer; premaxillaries protractile; scales cycloid. 



Labidesthes sicculus (Cope). BROOK SILVERSIDE 



Head 4.1 to 4.6; depth 6 to 8; D. iv-i, 9 to n; A. i, 21 to 24; 

 scales 75 to 79. 



Body elongate, very slender; head long and pointed; snout long 

 and slender, the jaws prolonged into a short depressed beak; its 

 length nearly twice diameter of eye; eye 3.5 to 4.0 in head; jaws 



FIG. 59. BROOK SILVERSIDE. 



Labidesthes sicculus (Cope). (After Forbes and Richardson.) 



equal, edge of the upper strongly curved; cheeks and opercles 

 with scales ; ventrals abdominal ; caudal fin forked ; lateral line repre- 

 sented on a few scales only. 



Color pale olive-green, translucent; a distinct silvery lateral band, 

 bounded above by a dark line; back dotted with black. 



Length 3 inches. 



This fish ranges from Iowa to New York, Florida, and Texas. 



Fox River, McHenry,. Illinois; Wolf Lake, Roby, Indiana; Lake 

 George, Indiana. 



Family Aphredoderidee. 



THE PIRATE PERCHES. 



Body moderately elongate, compressed; dorsal region elevated; 

 caudal peduncle thick; body and sides of head with strongly ctenoid 

 scales; ventral fins thoracic, with a small spine and more than 5 soft 

 rays; dorsal fin single, with 3 or 4 small spines; anal fin with 2 slender 

 spines; gill membranes slightly joined to isthmus; gill rakers short 

 and thick, toothed; preopercle and preorbital sharply serrate; opercle 

 with a spine; air bladder simple, duct not evident; pyloric cceca 

 about 12. 



