176 THE AMERICAN CHARACIDAE. 
yy. Lateral band not bordered above with 
silvery. Origin of the anal on the verti- 
cal from the third dorsal ray. D. 11; 
A. 26 to 28; scales 6 or 7-30 to 36-5. 
36. melanopleurus Ellis. 
1. HypHrssoprycon compressus (Meek). 
Plate 24, fig. 1; Plate 79, fig. 14. 
Hemigrammus compressus MEEK, Field Columbian mus. Publication, 1904, Zool. ser. 6, p. 87 (El Hule, 
Oaxaca in basin of Papalvani). 
Hyphessobrycon compressus EIGENMANN, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 436. 
Hapsitrat.— Mexico. 
Specimens examined. 
Catalogue Number of 
number specimens Size in mm. Locality Collector 
10798, 11126 I. 7 36-42 Obispo, Vera Cruz, Mex. Meek 
10929 I. 1 +4 Perez, Mex. Meek 
Head 3.5-3.7; depth 2.5-2.7; D.11; A. 25-27; scales 8-45 to 48-7; eye 
2.5 or a little more in the head; interorbital 3 to 3.5 in the head, much less 
than the eye. 
Compressed, comparatively deep; depth of head at the base of the occipital 
process 1.75 in the greatest depth. Preventral region rounded, without regular 
median series of scales. Predorsal region slightly keeled, a regular series of 
about 18 narrow median scales. 
Occipital process 5 in the distance between its base and the dorsal, bor- 
dered by about 5 scales. Interorbital very slightly convex. Frontal fontanel 
triangular, narrower than and almost as long as the parietal without the occi- 
pital groove. Second suborbital small, leaving a naked area behind and below 
as wide as the bone. Maxillary equal to the eye; mandible 1.25 to 1.3 times 
the eye. Snout short, 2 in the length of the eye. Mouth large; premaxillary 
with five tricuspid teeth in the inner, and two or three tricuspid teeth in the outer 
row; the two rows close together. Maxillary with four to seven conical or 
tricuspid teeth placed far apart. Dentary with a graduated series of five tri- 
cuspid teeth followed by a series of minute conical ones on the sides of the jaw. 
Gill-rakers 12 + 7, the longest nearly half the length of the eye. 
Seales small and narrow. Imbrication usually regular, in one instance 
a row of seales dropped out above the middle of the ventrals. Anal sheath 
short, consisting of 5 to 8 scales, and covering the base of the first 5 or 6 rays. 
Lateral line developed on 6 scales. 
