THE AMERICAN TETRAGONOPTERINAE. 203 
ones in the outer row. Maxillary with two 3- to 5-pointed teeth. Dentary 
with a graduated series of five 5- to 7-pointed teeth. 
Caudal naked, but with a sheath two scales deep. Anal sheath short. 
Lateral line with about 17 scales with pores. 
Origin of the dorsal half the length of the eye nearer the caudal than the 
snout, the penultimate ray 2.5 in the longest which is 3.75 in the length. Origin 
of the anal on the vertical from the second scale behind the dorsal. Longest 
anal ray is 1.5 in the anal base. Ventrals on the vertical from the second scale 
in front of the dorsal. Ventrals reaching or not reaching the anal, pectorals 
reaching or not reaching the ventrals. 
Humeral spot usually obscure; caudal spot usually faint, extending to the 
end of the middle caudal rays; lateral band very faint, overlaid with silvery, 
distinct stripes following the scales above the lateral line; dorsal and anal dusky. 
23. HyYPHESSOBRYCON METAE Higenmann and Henn. 
Plate 93, fig. 3. 
Hyphessobrycon metae EtGENMANN & Henn, Indiana univ. studies, 1914, no. 24, p. 233. 
Hasirat.— Rio Meta. 
Specimens examined. 
Number of Size 
Catalogue number specimens in mm. Locality Collector 
13421 I. Type 1 34 Barrigona, Rio Meta Gonzales 
13422 I. Paratypes 66 16-35 Barrigona, Rio Meta Gonzales 
19 20 21 
Head 3.54, equal to depth at origin of dorsal; D. 11; A. 19-23, 5, 7,7, 
*2' 3 (the denominator represents the number of individuals); scales about 
Ue Tees tis) 
30 in a longitudinal series, 10 in transverse series; pores developed on 6 (rarely 
7) scales; 9 or 10 scales between occipital and dorsal origin; scales 5-6 + 24- 
4: eye 2.3-2.6 in head, about equal to interorbital; caudal peduncle about 
equal to eye and 1.2 in its own depth. 
Slender, compressed; predorsal area rounded, with a median series of 9 
or 10 scales, preventral area rounded, with a median interpolated series of 
small (6) scales. Occipital process 6 in the distance from its base to the dorsal, 
bordered by 2 or 3 scales, interorbital slightly convex; fontanels very large. 
First and second suborbitals leaving a high naked margin behind and below. 
Mouth blunt, terminal; maxillary five sixths the length of the eye. Pre- 
