152 Annals of the Carnegie Museum. 



Colypes, thirteen specimens, 27 to 36 mm. C. M. No. 3010. Porto Uniao. 

 Rio Iguassii. 



Head 3.8-4; depth 3; D. 11 ; A. 14 to 16; scales 5 or 6-32 to 36-4 

 to 5. Eye 3 to 3.25; interorbital much wider than the eye, 2.2 in 

 the head. Little compressed, depth of the head at the base of the 

 occipital process 1.25 in the greatest depth. Preventral region 

 rounded, without complete series of median scales. Predorsal region 

 rounded. Occipital process a little more than 4 in the distance from 

 its base to the dorsal, bordered by two or three scales. Frontal 

 fontanel triangular, as wide as the parietal, two-thirds as long as the 

 parietal without the occipital groove. Second suborbital leaving a 

 narrow naked margin behind and below. Maxillary margin very 

 convex, the proximal third much constricted, very short, 1.5 in the eye 

 or nearly 5 in the head; mandible also short, equal to the eye, about 

 3 in the head. Mouth moderately large; snout very short, equal to 

 the maxillary. Premaxillary with three three- to five-pointed teeth 

 in the outer row, and five broad five- to seven-pointed teeth in the 

 inner row; the last of the inner series is often much reduced. Maxil- 

 lary without teeth. Dentary with graduated series of four or five five- 

 to seven-pointed teeth, followed by one or two small notched teeth 

 on the sides. Gill-rakers 7 + 10. Anal sheath rudimentary. Lateral 

 line with pores developed on five to nine scales. Origin of the dorsal 

 the length of the eye nearer to the caudal than to the snout, the longest 

 ray 4.0 in the length. Caudal equal to the head. Origin of the anal 

 on the vertical from the second or third scale behind the dorsal. 

 Anal emarginate; the longest rays almost equal to the anal base, 

 which about equals the head without the preopercle. Anal armature 

 developed on the first six or seven rays. Ventrals on the vertical 

 from the first or second scale in front of the dorsal; reaching the first, 

 second, or third scale, in front of the anal. Pectorals reaching the 

 second, or third scales, in front of the ventrals. Humeral spot lacking. 

 Caudal spot sharply constricted behind, and continued to the end of the 

 middle caudal rays, continued forward as a heavy lateral stripe, which 

 often reaches the upper angle of the preopercle. The lateral stripe over- 

 laid with dull silvery. Dorsal, caudal, pectorals, and first five anal 

 rays, dusky. Scales of the back outlined with dusky. Bluish irrides- 

 cent on the sides over and below the lateral stripe. 



