L56 Annals of the Carnegie Museum. 



suddenly constricted behind and continued to the end of the middle caudal 

 rays. Lateral stripe overlaid with silvery. Distal third of the anal 

 more or less dusky. Scales of the back dusky. Scales of the sides, 

 especially below the lateral stripe, with a silvery blue iridescence. 

 One specimen 73 mm., Rio das Velhas (C. M. Cat. Xo. 30760) 

 differed from typical specimens as follows: Depth 3.2. Maxillary 

 with three small tricuspid teeth. Caudal spot and lateral stripe quite 

 diffuse; humeral spot intense, and somewhat widened dorsally. 



8. Hyphessobrycon bifasciatus sp. now 

 Plate II, fig. 4, cf; Plate III, fig. 1, 9- 



Type, 44 mm. d\ 37 mm. 9. C. M. No. 3026. Campos. 



Cotypes, thirty-five specimens, 29 to 44 mm. C. M. No. 3027. Sao Joao da 

 Barra. 



Cotypes, two specimens, 41 and 38 mm. C. M. No. 3028. Xiririca. 



Cotype, one specimen, 40 mm. C. M. No. 3029. Porto Alegre. 



Cotypes, two specimens, cf. 35 mm.; and 9 , 47 mm. C. M. No. 3030. Morretes. 



Cotypes, forty-two specimens, 26 to 46 mm. C. M. No. 2936. Muniz Freire. 



Cotypes, thirteen specimens, 31 to 44 mm. C. M. No. 3032. Lagoa Feia, Tocas. 



Cotypes, seventy-eight specimens, 29 to 47 mm. C. M. No. 3034. Campos. 



Cotypes, twenty-seven specimens, 16 to 24 and 44 mm. C. M. No. 2935. Ca- 

 cequy. 



Head 3.8; depth 2.5; D. 11; A. 29-32; scales 6 or 7-33 to 36-5 or 

 6; eye 2.3 to 2.5 in the head. Interorbital almost equals the eye. 2.8 

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

 process 1.67 in the greatest depth. Preventral and predorsal regions 

 rounded, without complete series of median scales. Occipital process 

 about 5 in the distance from its base to the dorsal. Interorbital 

 slightly convex; frontal fontanel triangular, as wide as the parietal 

 and four-fifths as long as the parietal without the occipital groove. 

 Second suborbital leaving a .naked margin, equal to half its own width, 

 hehi ml and below. Maxillary not quite equal to the eye, a little more 

 than 3 in the head. Mandible equal to the eye. Mouth moderate, 

 snout .5 in the eye. Premaxillary with three or four narrow tricuspid 

 or broadly conical teeth in the outer row, and four or five five- to 

 seven-pointed teeth in the inner row. Maxillary with one three- or 

 jive-pointed tooth of medium size. Dentary with a weakly graduated 

 series of four, sometimes five, five- to seven-pointed teeth, followed 

 by two or three quite small teeth on the sides. Gill-rakers 6 + 10. 

 S( ales mi 1 he ventral half of the sides facing a little obliquely backwards 



