194 THE AMERICAN CHARACIDAE. 
16. HyYPHESSOBRYCON MINIMUS Durbin. 
Plate 22, fig. 6. 
Hyphessobrycon minimus Dursin, Ann. Carnegie mus., 1909, 6, p. 68 (Cane Grove Corner, British 
Guiana; ErGeNMANN, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 486; Mem. Carnegie 
mus., 1912, 5, p. 341, pl. 49, fig. 2. 
Hasirat.— Guiana. 
Specimens examined. 
Number of 
Catalogue number specimens Size in mm. Locality Collector 
1193 C. Type 1 18 Cane Grove Corner Eigenmann 
11769 I. Paratypes 4 16-21 Cane Grove Corner Eigenmann 
Head 3.33 to 3.67; depth 3.5 to 3.75; D. 11; A. 16 or 17; scales 5-30 to 
33-3; eye 2+ in head, snout less than the eye, interorbital less than eye, about 
3 in the head. 
Compressed, depth of head at base of the occipital process five sixths of or 
equal to the greatest depth. Preventral region rounded, without regular com- 
plete series of median scales. Predorsal region rounded, with a regular series 
of 9 or 10 median scales. 
Occipital process short, bordered by 1 to 1.5 seales. Frontal fontanels 
much narrower than the parietal, about three fourths the length of the parietal 
without the occipital groove. Second suborbital leaving a narrow naked margin 
behind and below. Snout short, about 2 in the length of the eye; mouth mod- 
erately large. Maxillary less than the eye, 2.75 in the head. Mandible a little 
more than 2 in the head. Premaxillary with two, rarely three, small tricuspid 
teeth in the outer row, and five broad, 5- to 7-pointed teeth in the inner row, the 
tooth at the median end of the inner row of each premaxillary fitting together so 
that the two apparently form a very large median tooth. Maxillary with two 
or three broad 5- and 7-pointed teeth. Dentary with four large 7-pointed teeth 
followed on the sides by one or two minute tricuspid teeth. 
Anal sheath of 3 scales covering the base of the first 5 or 6 rays. Lateral 
line with pores developed on 5 to 8 scales. 
Origin of the dorsal equidistant from the snout and caudal, its longest 
ray 3.5 in the length. Origin of anal on the vertical from the last 2 or 3 dorsal 
rays. Anal emarginate, the longest ray 1.5 in the base. Ventrals on the verti- 
cal from the second dorsal ray. Ventrals just reaching the anal. Pectorals 
just reaching the ventrals. 
