April, 1910. Fishes of Chicago — Meek and Hildebrand. 279 



I ; alimentary canal scarcely as long as the body; peritoneum silvery; 

 dorsal fin a little in advance of ventrals, much nearer tip of snout than 

 base of caudal; lateral line complete; 14 to 16 rows of scales in series 

 before dorsal fin. 



Color light olivaceous above, silvery below; an indistinct lateral 

 band; no caudal spot. 



Length 5 to 6 inches. 



This species inhabits the larger streams from Wyoming to Ohio 

 and Arkansas. 



Hybopsis kentuckiensis (Rafinesque). River Chub; Horny-head. 



Head 3.6 to 3.8; depth 3.9 to 4.5; D. 8; A. 7 ; scales 39 to 44. 



Body elongate, robust, little compressed; head conical, the top 

 convex; mouth rather large, little oblique, the tip of upper lip on level 

 with point about midway between lower margin of eye and chin ; max- 

 illary not quite reaching eye, 3.0 to 3.6 in head; snout bluntish, 2.4 

 to 2.9 in head; diameter of eye 4.1 to 5.6; lower jaw shorter than the 



Fig. 44. River Chub; Horny-head. 



Hybopsis kentuckiensis (Raf.). (From Forbes and Richardson.) 



upper; teeth 4-4, or i, 4-4, i; alimentary canal i to 1.4 times length 

 of the body; peritoneum dusky; dorsal fin inserted over ventrals, and 

 a little nearer base of caudal than tip of snout; lateral line complete 

 or nearly so; 17 to 22 rows of scales in a series before dorsal fin. 



Color greenish olivaceous above, lighter below; an indistinct lat- 

 eral band ending in a dark caudal spot, more prominent in the young; 

 a pale reddish spot behind eye. 



Length 6 to 8 inches. 



This species ranges from Wyoming to Pennsylvania, and Alabama. 



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

 nois; Hickory Creek, Marley, Illinois; Hickory Creek, New Lenox, 

 Illinois. 



