30 
AA. 
AA. 
THE FISHES OF OHIO. 
Order: PLECTOSPONDYLI. 
Sub-Order: EVENTOGNATHI. 
Family: Catostomip# (The Suckers). 
Key to Genera. 
Dorsal fin elongate, developed rays 25 to 50, air bladder in 2 parts. 
B. Fontanelle present, body ovate, scales large. 
Cc. Mouth large, more or less terminal, protractile forward; pharyngeal 
bones and teeth moderate, large species of dark color.— ICTIOBUS. 
CC. Mouth smaller, inferior, protractile downward ; pharyngeal bones nar- 
row, the teeth thin and weak ; smaller species, pale in color.— 
CARPIODES. 
BB. Fontanelle obliterated by union of parietal bones;. body elongate; scales 
rather small; lips thick and papillose.— CYCLEPTUS. 
Dorsal fin short, 10 to 18 developed rays. 
D. Air bladder in 2 parts. 
E. Lateral line present, complete and continuous ; scales small, more than 
50 in lateral line. — CATOSTOMUS. 
EE. lateral line interrupted or wanting, scales large, less than 50 in lat. line. 
F. Lateral line entirely wanting.— ERIMYZON. 
FF. Lateral line more or less developed, especially in the adult.— 
MINYTREMA. 
DD. Air bladder in 3 parts; scales large; lateral line complete. 
G. Mouth normal, the lower lip entire or merely lobed, the upper lip pro- 
tractile. 
H. Pharyngeal bones moderate, the teeth compressed, not molar-like, 
increasing in size gradually downward.— MOXOSTOMA. 
HH. Pharyngeal bones very strong, the lower teeth very much enlarged, 
cylindrical and truncate, molar-like.— PLACOPHARYNX. 
GG. Mouth singular, the upper lip not protractile, greatly enlarged, the lower 
lip developed as two separate lobes.— LAGOCHILA, 
Genus:  ICTIOBUS. 
Key to Species. 
Mouth large, terminal, protractile forward ; lips very thin, lower pharyngeals and 
teeth weak.— cyprinella. 
Mouth smaller, more or less inferior, and with thicker lips; pharyngeal bones 
stronger ; the teeth comparatively coarse and large. 
B. Back scarcely elevated, depth 3 to 3% in length.— uUurus. 
BB. Back elevated and compressed, depth 2% to 2%.— : bubalus. 
Ictiobus cyprinella (Cuvier and Valenciennes). COMMON BUFFALO FISH ; 
RED-MOUTHED BUFFALO. 
Head very large and thick, 314 inlength ; depth 2% to3%. Developed 
rays of dorsal fin 27 to 29; anal g; ventrals 10. Scales 7-37 to 41-6. Body 
robust, moderately compressed, the outline somewhat elliptical, but the back 
rather more curved than the belly. Opercular apparatus very strong, the 
operculum forming nearly % the length of the head. Color dull brownish 
olive, not silvery, fins dusky. Length nearly 3 feet. 
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