158 Annals of the Carnegie Museum. 



Occipital process short, about 8 in the distance from its base to the 

 dorsal. Interorbital nearly flat; frontal fontanel narrowly triangular, 

 as wide as the parietal and 1.5 in the parietal without the occipital 

 groove. Maxillary a little less and mandible a little more than the 

 eye. Snout very short, 1.8 in the head; mouth rather large. Pre- 

 maxillary with four tricuspid teeth in the inner row and two or three 

 slightly narrower teeth in the outer row; maxillary with four or 

 five narrow tricuspid to conical teeth; dentary with a series of four 

 strong tricuspid teeth, followed by about seven minute conical teeth 

 on the side. Gill-rakers 6 + 9, each with a single row of very small 

 retrorse spines. Lateral line with pores developed on seven to nine 

 scales. Origin of the dorsal nearly the length of the eye nearer the 

 caudal than to the snout; highest dorsal ray 1.3 in the head. Origin 

 of the anal on the vertical from the third dorsal ray. Anal rather 

 deeply emarginate; longest anal ray about 2 in the base of anal and 

 about 1.7 in the head. Ventrals on the vertical from the fourth or 

 fifth scale in front of the dorsal; short and weak, scarcely reaching 

 the first long anal rays. Pectorals large, reaching beyond the middle 

 of the ventrals. Ground-color light; a broad backish stripe from the 

 eye to the end of the middle caudal rays, becoming fainter behind 

 the adipose; a very faint vertical elongation of the lateral' stripe in 

 the region of the humeral spot. A faint, dusk}', oblique stripe across 

 the dorsal from the base of the first to the tips of the seventh and 

 eighth rays. All of the fins a little dusky. Scales of the back heavily 

 outlined with dusky, top of the head and lips quite dark. Sides and 

 head silvery between the lateral stripes. 



10. Hyphessobrycon callistus (Boulenger). 



Four specimens, 31 to 39 mm. C. M. No. 3037. From vicinity of Corumba. 

 Six specimens, 25 to 38 mm. C. M. No. 3038. Jauru. 

 Eight specimens, 26 to 38 mm. C. M. No. 3039. Caceres. 

 Fourteen specimens, 33 to 38 mm. C. M. No. 3040. Puerto Suarez. 



11. Hyphessobrycon santae (Eigenmann). 



Six specimens, 33 to 42 mm. CM. No. 3033. Sete Lagoas. 

 One specimen, 58 mm. C. M. No. 3034. Mogy das Cruzes. 



12. Hyphessobrycon anisitsi (Eigenmann). 



Thirty-six specimens, 30 to 45 mm. C. M. No. 3046. Miguel Calmore, in a 

 lake four miles from the town. 



Twenty-one specimens, 21 to 44 mm. C. M. No. 3017. Jundaihy, Sao Paulo. 



