11 D CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



'Lips distinctly plicate — Continued. 



XXX. Head still shorter and deeper, 4^ to 5 in lengtL, 

 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 macrolepulolHm. 



hh. Head comparatively short, low and small, 5 to 5J 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 G-4"2 to 48-5: size large, 



AUREOLCM, 6. 



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



small, about 5 in length, 



r. Body llattisb, the back elevated and compressed; dei)th 3J : 



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 bhading 



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



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



CIlASSILAnUE, 7. 



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

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

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

 much longer than in M. craHHilabre : dorsal rays 11 : eye 

 large: coloration smoky above, some scales dusky at their 



bases ; sides ]»ale ; lower fins white coxes, 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 3J 

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

 in aurcolum. D. 12-13, half higher than long : scales (>-4(>-5. 



ANisruA, 9. 

 ddd. Caudal fin with the lower lobe much longer than the upper and difl'er- 

 ently colored, the upper h>be in the adult being red, the 

 inferior jet-black, its two hnvermost developed rays and 

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

 elongate, umderately compressed, somewhat elevated for- 

 wards ; depth 4i in kngth: 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 email poeciluka, 10. 



