192 THE AMERICAN CHARACIDAE. 
Occipital process a little more than 4 in the distance from its base to the 
dorsal, bordered by 2 or 3 scales. Frontal fontanel triangular, as wide as the 
parietal, two thirds of the parietal without the occipital groove. Second sub- 
orbital leaving a narrow naked margin behind and below. Maxillary margin 
very convex, the proximal third much constricted, very short, 1.5 in the eye or 
nearly 5 in the head; mandible short, equal to the eye, about 3 in the head. 
Mouth moderately large; snout very short, equal to the maxillary. Premaxil- 
lary with three 3- to 5-pointed teeth in the outer row, and five broad 5- to 7- 
pointed teeth in the inner row; the last of the inner series is often much reduced. 
Maxillary without teeth. Dentary with graduated series of four or five 5- to 
7-pointed teeth followed by one or two small notched teeth on the sides. 
Gill-rakers 7 + 10. 
Anal sheath rudimentary. Lateral line with pores developed on 5 to 9 
scales. 
Origin of the dorsal the length of the eye nearer to the caudal than to the 
snout, the longest ray 4.6-5 in the length. Caudal equal to the head. Origin 
of the anal on the vertical from the second or third scale behind the dorsal. 
Anal emarginate, the longest rays almost equal to the anal base which about 
equals the head without the preopercle. Anal armature developed on the first 
six or seven rays. Ventrals on the vertical from the first or second scale in 
front of the dorsal, reaching the first, second, or third scale in front of the anal. 
Pectorals reaching the second or third scale in front of the ventrals. 
Humeral spot lacking. Caudal spot sharply constricted behind and con- 
tinued to the end of the middle caudal rays, continued forward as a heavy lat- 
eral stripe which often reaches the upper angle of the preopercle. The lateral 
stripe overlaid with a dull silvery. Dorsal, caudal, pectorals, and first five 
anal rays dusky. Scales of the back outlined with dusky. Bluish iridescence 
on the sides over and below the lateral stripe. 
15. HypHESSOBRYCON PARVELLUS Ellis. 
Plate 29, fig. 1. 
Hyphessobrycon parvellus Eui1s, Ann. Carnegie mus., 1911, 8, p. 153, pl. 2, fig. 1. 
Hasirat.— Southeastern Brazil. 
