46 CHECK LIST OF THE 



SUBGENUS HYBOPSIS. 



(52) Lake Minnow. 



(Hybopsis storerianus.) 



Body rather elongate; back elevated, ascending gradually to begin- 

 ning of dorsal, then descending to the caudal fin ; head short, interorbital 

 space broad, flat; mouth rather small, horizontal, the lower jaw included ; 

 barbel conspicuous; snout abruptly decurved, the tip thickened; lateral 

 line somewhat decurved ; fins high ; dorsal inserted well forward, over 

 ventrals ; pectoral fins pointed; caudal long, deeply forked. Scales, 5-42-4. 

 D., 8; A., 8. 



Colour, greenish above ; sides and below brilliant silvery ; fins plain. 

 Length, about eight inches. 



This fish has been taken in Lake Ontario waters and also in Lake 

 Erie, but I have no other records. 



GENUS COUESIUS. 



Body elongate; head normal, not depressed, the profile convex ; mouth 

 terminal, normal, a well developed barbel on the anterior side of maxil- 

 lary, just above its tip. Teeth, 2, 4-4, 2, hooked without grinding sur- 

 face. Scales rather small ; lateral line continuous. Dorsal fin over or 

 slightly behind ventrals ; anal basis short. Size rather large. This genus 

 is closely related to the section Nocomis under Hybopsis, from which it 

 may be separated by the presence of two teeth in the lesser row, by the 

 position of the barbel, and by the smaller scales. Its relations with Semo- 

 tilus are equally close. 



(53) Lake Chub. 



(Couesius plumbeus.) 



Body moderately elongate and somewhat compressed ; head rather 

 flat above, not much raised above the level of the eyes ; maxillary reaching 

 to below front of orbit, a small barbel placed high at its tip ; lower jaw 

 included. Lateral line beginning high up on the nape, abruptly descend- 

 ing to the median line over the pectoral fin, and thence running nearly 

 straight to the caudal fin. Dorsal origin midway between tip of snout 

 and base of caudal fin. Caudal deeply forked. Scales small, 13-65-8. 

 Teeth, 2, 4-4, 2. 



Colour dusky above, sides silvery with a plumbeous lateral band ; fins 

 plain. Length, about six inches. 



This species ranges through Canada from New Brunswick to Lake 

 Superior and is tolerably common throughout ; more especially north- 

 ward. The Lake Superior form is C. p. dissimilis. 



GENUS EXOGLOSSUM. 



Body rather short and stout, subterete ; lower jaw three lobed, the 

 dentary bones being close together and completely united, not forming a 



