184 THE AMERICAN CHARACIDAE. 
Interorbital flat. Frontal fontanel small, triangular, and two thirds the length 
of the parietal without the occipital groove. Second suborbital in contact 
with the preopercle below, having a narrow naked line behind; third suborbital 
narrow. Maxillary equal to the eye; mandible a little longer than the eye, 
a little more than two times in the head. Snout short. Premaxillary with two 
or three conical teeth in the outer row, and eight teeth, the first four always 
tricuspid, and the rest either tricuspid or conical, in the inner row. Maxillary 
with from four to eight, usually six, conical or narrowly three-pointed teeth. 
Dentary with five, rarely four, 3- to 5-pointed teeth; eight to thirteen minute 
conical ones on the side. 
Gill-rakers 8 + 14, long and slender. 
Seales are mostly lost in the specimens. 
The origin of the dorsal the length of the eye nearer to the snout than to 
the base of the caudal; the penultimate ray about 2.33 in the longest, which 
is 3.5 in the length. Caudal equals the length of the head. Anal somewhat 
emarginate, its origin on the vertical from the sixth dorsal ray; penultimate 
ray 3 in the longest which is 3.75 in the length. Ventrals on a vertical half 
the length of the eye, or a little more, in front of the dorsal, and reaching to 
the third anal ray. Pectorals overlapping a third of the ventrals. 
A round black spot on the distal half of the second to sixth dorsal rays; 
the first, second, and third rays tipped with white, a white bar bounding the 
lower margin of the spot and covering the outer half of the proximal half of the 
marked rays, the basal fourth and other five rays hyaline. Anal, caudal, and 
other fins a little dusky. Upper scales margined with dusky. A very indis- 
tinct broad lateral band passing from the indistinct, or almost obsolete, brown 
humeral spot to the caudal peduncle. No caudal spot. 
8. HypHessoprycon rosAcEUS Durbin. 
Plate 23, fig. 5. 
Hyphessobrycon rosaceus Dursin, Ann. Carnegie mus., 1909, 6, p. 67 (Gluck Island and Rockstone, Brit. 
Guiana); EraenMann, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 436; Mem. Carnegie 
mus., 1912, 5, p. 339, pl. 2, fig. 1; Ennis, Ann. Carnegie mus., 1911, 8, p. 159. 
Hasirat.— British Guiana, Guaporé Basin. 
