278 Field Museum of Natural History — Zoology, Vol. VII. 



body; peritoneum black; dorsal fin in front of ventrals, about equi- 

 distant between tip of snout and base of caudal; scales 14 to 17 in 

 series before dorsal fin; lateral line complete. 



Color olivaceous, the sides silvery; a bluish lateral band; back 

 and sides with irregular dark blotches. 



Length 3 inches. 



This fish ranges from Ohio to Iowa and Arkansas. 



Hybopsis ambiops (Rafinesque). Big-eyed Chub; Silvery Chub. 



Head 3.6 to 3.9; depth 4.6 to 5.2; D. 8; A. 7; scales 35 to 38. 



Body elongate, rather robust; head broad, flattened above; mouth 

 small, horizontal, subinferior, the tip of the lower jaw little in advance 

 of first nostril ; the tip of the upper lip below the level of lower margin 



Fig. 43. Big-eyed Chub; Silvery Chub. 



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



of the eye; maxillary usually reaching vertical from front of orbit, 

 its length 3.6 to 4.6 in the head; barbel small; snout blunt, usually 

 overhanging the small mouth, 2.9 to 3.4 in head; diameter of eye 

 2,8 to 3.1 in head; teeth i, 4-4, i, hooked at tip and with narrow 

 grinding surface ; alimentary canal shorter than the fish ; peritoneum 

 coarsely specked with brown; dorsal fin over ventrals, about equi- 

 distant between tip of snout and base of caudal fin; 12 to 15 scales 

 in series between nape and dorsal fin; lateral line complete. 



Color olivaceous, silvery; a dusky lateral band continued forward 

 through the eye to end of snout; no dark caudal spot. 



Length 2 to 3 inches. 



This species ranges from New York to Iowa and Alabama. 



Hybopsis storerianus (Kirtland). Storer's Chub. 



Head 4.3 to 5.3; depth 4.3 to 5.3; D. 8; A. 7, 8, or 9; scales 37 

 to 40. 



Body elongate, more or less compressed ; head short, compressed ; 

 preorbital bone especially prominent; mouth small, inferior, and hori- 

 zontal, tip of upper lip far below level of lower margin of eye; max- 

 illary scarcely reaching front of orbit, its length 3.2 to 3.7 in head; 

 snout blunt, 2.8 to 3.1 ; diameter of eye 2.9 to 3.4; teeth o or i, 4-4, 



