160 Annals of the Carnegie Museum. 



Cotypes, five specimens, 37 to 42 mm. C. M. No, 3061. Jaguara. 



Cotypes, five specimens, 32 to 39 mm. C. M. No. 3062. Rio Paiaia. 



Cotypes, eight specimens, 32 to 38 mm. C. M. No. 3063. Barreiras, Lagoas 

 of Rio Grande. 



Cotypes, six specimens, 22 to 38 mm. C. M. No. 3064. Sete Lagoas. 



Cotypes, three specimens, 29 to 35 mm. C. M. No. 3065. Tinho, Riu Itapicuru. 



Cotype, one specimen, 40 mm. C. M. No. 3082. Maciel, Rio Guapore. 



Cotype, one specimen, 28 mm. C. M. No. 3084. Mogy Mirim, a creek in 

 Sao Paulo 



Cotypes, two specimens, 40 and 42 mm. C. M. No. 3584. Rio Zinga, Nov. 7, 

 1907. 



Cotypes, nine specimens, 26 to 32 mm. C. M. No. 3066. Riberao, Azula Lagoa, 

 12 miles from Tiete. 



Cotype, one specimen, 21 mm. C. M. No. 3067. Sapucay. 



Cotype, one specimen, 40 mm. C. M. No. 3077. Caceres. 



Cotype, one specimen, 34 mm. C. M. No. 3083. Rio Itapicuru, six miles north 

 of Bom Fim. 



Head 3.6 to 3.8; depth 2.8 to 3.25; D. 11 ; A. 20 to 24; scales 5-29 

 to 34-3 to 4. Eye 2 in the head. Interorbital less than the eye, 2.75 

 in the head. Compressed; depth of head at the base of the occipital 

 process 1.5 in the greatest depth. Preventral and predorsal regions 

 rounded, without complete series of median scales. 



Occipital process 5 or 6 in the distance from its base to the dorsal; 

 bordered by three scales. Interorbital slightly convex. Frontal 

 fontanel triangular, almost as wide as the parietal, and as long as the 

 parietal without the occipital groove. Second suborbital little more 

 than half the eye in width, usually with narrow naked margins behind 

 and below. Mouth large; snout little more than half the length of 

 the eye. Maxillary slender, just, or not quite, equal to the eye, 2 to 

 2.3 in the head. Mandible equal to the eye. Premaxillary with three 

 or four tricuspid teeth in the outer row, and four or five, rarely six, 

 three- to five-pointed teeth in the inner row T . Maxillary with two or 

 three, less often four, three- to five-pointed teeth, the posterior one 

 sometimes conical. Dentary with a graduated series of four or five 

 three- to five- and seven-pointed teeth, followed by a series of seven 

 to twelve minute, conical teeth on the sides. Gill-rakers 6 + 10. 

 Caudal scaled over the basal one-half. Anal sheath short, consisting 

 of about six scales over the bases of the first ten rays. Lateral line 

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

 equidistant from the snout and caudal; penultimate ray short, one- 

 fourth of the longest, which is 3.67 in the length. Origin of the anal 

 on the vertical from the first scale behind the dorsal. Anal emarginate. 



