19 



d. Length of eye about H of head; length of barbel about '3 of head; scales every 



where dusted with black specks over silvery color H. hyostomus. 



dd. Length of eye about 16 of head; length of barbel about 3-5 of eye; fine black 

 specks on posterior border of scales of back; lower lobe of caudal dark, 

 with white border.' 



cc. Eye large, its length about ^ or more of head; sides blotched; dusky or silvery. 



e. Mottled with black or brown. 



f. Scales 16 to 18 before dorsal H. dissimilis. 



ff. Scales 20 to 24 before dorsal H. watauoa. 



ee. Not mottled; silvery, dusted with dark specks, or scales edged with dusky. 



g. Head large, length 14 that of body, flattened above; muzzle bluntly decurved; 



eye, % length of head H. amblops. 



es- Head short, length less than ^4 of body; cheeks nearly vertical; a fleshy pad 



on end of snout H. stork ki an us. 



aa. Large species, with rather heavy body; mouth large, almost terminal; not silvery. 



H. KKNTUCKIKNSIS. 



Hybopsis tetranemus Gilbert. 



The only native minnow with four barbels. A. small, slender, silvery fish, with large 

 flns. Length 2 inches. 



Hybopsis hyostomus (Gilbert). 



Snout long and acute, projecting half its length beyond the mouth. A silvery mlniiow. 



Specimens referred to ff. hyostomus have been taken from the Illinois River at Havana 

 and Naples, and from the middle fork of the Big Vermilion River on the Champaign-Ford 

 county line- 



Hybopsis dissimilis (Kirtlaod). — Spotted Shiner. 



In form much like the sucker-mouth minnow (Phenacobius) ; length 3 to 4 inches. Dis- 

 tinguished readily from Phenacobius by the pair of barbels, the form of the lip, and the 

 dark irregular mottling of the back and sides. 



Taken from Rock River at Rockford and Dixon, from Tomahawk Creek near La Salle. 

 Spoon River at London Mills. Sangamon River at Decatur, and Embarras River at Charles- 

 ton. 



Hybopsis watauga Jordan & Evermann. 



Like ff. dissimilis in many respects, but with a bluish stripe passing aroand the snoat, 



the stripe bearing 8 to 12 small black spots. 



Hybopsis amblops (Rafinesque).— Silver Chub; Big-eye Chub. 



Head large and flattened; eyes directed upward; color silvery. 



Not infrequent in the streams of the Wabash and Ohio basins; taken flve times from the 

 middle course of the Illinois River and once from near its mouth; taken also from near the 

 mouth of Rock River, from a pond near Quincy, from the fc'angamon River, and flve times 

 from the Kaskaskia Kiver. 



Hybopsis storerianus (Kirtland) . 



Second in size among the species of this genus. A silvery chub, in appearance and size 

 somewhat like Eybogvathiis nuchtiUs. Mouth inferior, overhuug by the snout, which has a 

 peculiar fleshy pad on the end; barbels minute; cheeks vertical; eye hitrh and situated mid- 

 way between front and back of head; body tapering forward from the front of the dorsal; 

 head small. 



Nowhere common, though widely distributed in Illinois— from Cairo to East Dubuque and 

 from Danville to Quincy. Not taken from the Little Wabash. Big Muddy. Kaskaskia, or 

 Rock River basins, and found at only two points in the Illinois basin— the Illinois River at 

 Ottawa and Crooked Creek in Hancock county. 



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



A minnow of large size, growing to a length of 6 to 9 inches. Body fusiform, stout, about 

 evenly curved dorsally and ventrally; mouth wide; color olivaceous, sometimes bluish; flns 

 frequently tinged with yellowish or red. An excellent bait fish for bass because of its 

 hardiness. 



Confined to northern Illinois, not being found further south than Crab-apple Creek In 

 Moultrie county. Salt Creek in Logan county, and Flower Creek in Hancock county. 



^B. aelidus; not certainly known to occur in Illinois. 



