April, 1921. 



The Canadian Field-Naturalist. 



67 



Conesius plumbeus (above) and two specimens, ,one male and the other 

 female, of Leuciscus rubrilateralis. 



barbel not evident. Teeth 2.5-4.2 normally, 

 but number often reduced, frequently by 

 absorption, hooked and without grinding 

 surface. 



Fins small, rounded; dorsal inserted 

 well behind the ventrals, the tip, when de- 

 pressed, over middle of base of anal ; anal 

 smaller than dorsal and of same shape; 

 ventrals small, reaching nearly to vent in 

 males, not so far in females; pectorals in- 

 serted low, and reaching half way to ven- 

 trals. Scales small, a little reduced and 

 crowded anteriorly; lateral line complete 

 at all stages. 



Coloration, dull, bluish black above; 

 duller on the sides and passing into white 



below; a dark lateral band from black 

 patch on operculum to base of caudal, 

 sometimes not well defined anteriorly; a 

 paler narrow band above, and scattered 

 dark scales below; lateral surface below 

 band, and extending from base of pectoral 

 to caudal, red in breeding males; paler or 

 wanting in females. Dorsal and caudal 

 fins same color as the back; pectorals and 

 anal dusted; ventrals whitish. Length 5-6 

 inches. 



Ruhrilateralis is very close to, if not 

 identical with, L. carletoni Kendall, a spe- 

 cies reported from the state of Maine by> 

 Dr. Wm. Converse Kendall, (U. S. F. 

 Com., Vol. XXII, 1902, pp. 357-8). 



