70 Annals of the Carnegie Museum. 



Distinguished by an intensely black spot covering the ventral two- 

 thirds of the caudal peduncle, not continued upon the caudal rays. 

 Humeral spot faint, vertically elongate, scarcely visible on very dark 

 specimens. Maxillary teeth mostly conical, largest teeth with never 

 more than three points. Maxillary equal to the eye. 



Head 3-25-3.33, depth 2.5-2.7 ; D. 11, A. 17-20; scales 6-33 or 

 34-4 ; eye 2.5 in head ; snout about ^ the eye ; interorbitals almost 

 equal the eye, 2.75 in head. 



Compressed, head at base of occipital process § of greatest depth. 

 Preventral region rounded, without complete, regular series of median 

 scales. Postventral region narrow. Predorsal region rounded with 

 complete series of ten median scales. 



Occipital process about one- eighth of the distance from its base to 

 the dorsal, bordered by two or three scales. Interorbitals slightly 

 more convex than in any other species of this genus. Frontal fontanel 

 small, triangular, narrower than the parietal and two-thirds the parie- 

 tal without the occipital groove. Second suborbital leaving a narrow 

 naked margin behind but none below. Snout short, mouth large, 

 lower jaw protruding beyond the upper when the mouth is open. 

 Maxillary equal to the eye ; mandible scarcely longer than the eye, 

 about 2.3 in head. Premaxillary with three or four narrow tricuspid 

 teeth in the outer row and five or six tricuspid teeth in the inner row. 

 Maxillary with five to seven conical or very narrow three-pointed 

 teeth. Dentary with a series of four or sometimes five tricuspid teeth 

 followed by a graduated series of seven to ten minute conical and 

 three-pointed teeth on the side. 



Gillrakers about 6 -f- 10. 



Scales cycloid, regularly imbricate, striae several, variable in number ; 

 no interpolated scales or rows of scales. Anal sheath of four to seven 

 scales covering the bases of the first seven rays. Caudal naked ; an 

 axillary scale. Pores developed on seven to ten scales ; lateral line 

 only very slightly decurved. 



Origin of the dorsal equidistant from the caudal and snout ; penul- 

 timate ray one-third the longest, which is 3-3.25 into the length. 

 Origin of anal on the vertical from the last dorsal ray. Anal very 

 slightly emarginate, third ray not reaching to the base of the last ray, 

 the longest ray |-the length of the base, anal armature well developed. 

 Caudal equal to the head. Ventrals weak, on the vertical from the 

 first scale in front of the dorsal, or from the first dorsal ray ; ventrals 



