116 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



^Lips distinctly plicate Continued. 



xxx. Head still shorter and deeper, 4 to 5 in length, 

 its upper profile concurrent with the curve 

 of the back, which is considerably elevated, 

 the form being thus somewhat elliptical : sides 

 compressed : dorsal rays usually 13: coloration 

 little silvery, the sides reflecting brownish aud 

 golden ; back smoky, some of the scales dusky 



at base : scales 6-42 to 50-5 macrolepidotum. 



hh. Head comparatively short, low and small, 5 to & in length ; 

 back elevated and compressed ; depth 8 in length : mouth 

 rather small, more or less overpassed by the snout : color- 

 ation bright yellowish-brown, etc., not silvery ; lower fins 

 bright red : dorsal rays 13: scales 6-42 to 48-5: size large. 



AUREOLUM, 6. 



gg. Mouth very small, much overpassed by the conic muzzle : head 



small, about 5 in length. 



f. Body flattish, the back elevated and compressed; depth 3f : 

 muzzle contracted : scales large, 5-44-5 : dorsal rays usually 

 12 : dorsal fin elevated in front, its first soft ray longer than 

 the base of the fin : color silvery, with smoky shading 

 above, some of the scales blackish at their bases ; lower fins 

 white ; top of head, humeral bar, and dorsal fin dusky. 



CRASSILABRE, 7. 



ii. Body flattish, the dorsal outline elevated, the form being like 

 that of M. coregonus: head small and conic : mouth exceed- 

 ingly small, the snout far overpassing it, the muzzle being 

 much longer than in M. crassilabre : dorsal rays 14 : eye 

 large : coloration smoky above, some scales dusky at their 



bases ; sides pale ; lower fins white CONUS, 8. 



dd, Caudal fin with the upper lobe falcate, much longer than the lower, at 

 least in the adult, the lobes similarly colored : dorsal fin short and 

 high, falcate : body compressed ; back somewhat elevated ; depth 3 

 in length : Lead conic, flattish, 5 in length : mouth very small, much as 

 in aureolum. D. 12-13, half higher than long : scales 6-46-5. 



ANISURA, 9. 



ddd. Caudal fin with the lower lobe much longer than the upper and differ- 

 ently colored, the upper lobe in the adult being red, the 

 inferior jet-black, its two lowermost developed rays and 

 their membranes abruptly white (? in both sexes). Body 

 elongate, moderately compressed, somewhat elevated for- 

 wards ; depth 4J- in length : head about the same : mouth 

 medium, the lips full : dorsal rays 13 : scales large, 5-44-4 : 

 coloration usual, except of the caudal fin ; other fins all red, 

 with blackish shadings : size small PCECILURA, 10. 



