154 Annals of the Carnegie Museum. 



Colype, one specimen, 45 mm. C. M. No. 3021. Mogy das Cruzes, Rio Tiete. 



( otypes, eight specimens, 20 to 46 mm. C. M. No. 3022. Iguape, in fresh 

 water near the sea. Five specimens, 15 to 18 mm. (without caudal), have archaic 

 pectorals. 

 ■ Cotype, one specimen, 26 mm. C. M. No. 2946. Cacequy. 



Colype, one specimen, 30 mm. C. M. No. 3586. Rio Doce, May 26, 1908. 



Head 3.5-3.7; depth 2.5 or 2.6; D. 11 ; A. 18 to 21; scales 6 

 to 7-31 to 34-4 to 5 eye 2.7 to 3 in the head. Interorbital a little 

 more than the eye, 2.2 in the head. Compressed, depth of the head 

 at base of the occipital process 1.5 in the greatest depth. Peventral 

 region rounded, without complete '"median series of scales. Predorsal 

 region usually with a regular series of eleven to fourteen median 

 scales. Occipital process 6 in the distance from its base to the dorsal, 

 bordered by two scales. Interorbital nearly flat. Frontal fontanel 

 triangular, as wide as the parietal, and three-fourths as long as the 

 parietal without the occipital groove. Second suborbital in contact 

 with the preopercle below and behind. Maxillary equal to the eye, 

 mandible a little longer than the eye, 2.1 in the head. . Mouth large, 

 snout very short. Premaxillary with three to five tricuspid teeth in 

 the outer row, and five three- to five-pointed teeth in the inner row. 

 Maxillary rarely without teeth, usually with one small three- to five- 

 pointed tooth. Dentary with a graduated series of four or five three- 

 to five-pointed teeth, followed by one or two small tricuspid teeth and 

 five or six very minute conical teeth on the side. Gill-rakers 7+9. 

 Anal sheath of about nine scales covering the bases of the first ten 

 rays. Lateral line with pores developed on the first five to seven rays. 

 Origin of the dorsal the length of the eye nearer to the caudal than 

 to the snout, penultimate ray 2.5 in the longest, which is 4.25 in the 

 length. Caudal a little longer than the head. Origin of the anal 

 on the vertical from the seventh or eighth dorsal rays. Base of anal 

 convex. Anal subtruncate or only slightly emarginate, the longest ray 

 1.5 in the base. Ventrals on the vertical from the fourth scale in 

 front of the dorsal. Ventrals just reaching the anal. Pectorals 

 Utile more than just reaching the ventrals. Humeral spot intense 

 black, round, hut with faint vertical elongations, sometimes surrounded, 

 more often followed, by a light area. Caudal spot irregular, more in- 

 tense on the fin than on the caudal peduncle, never extending as far 

 as half-way to the end of the middle caudal rays. A narrow but intense 

 lateral stripe in the region above the anal, fading out just before it 

 joins the caudal spot and just in front of the vertical from the dorsab 



