200 THE AMERICAN CHARACIDAE. 
Very similar to Astyanax ruberrimus from the San Juan and Dagua Rivers 
from which the specimens with a complete lateral line can only be distinguished 
with difficulty. Its formal distinguishing features are the smaller number of 
anal rays, and smaller number of scales, and the nature of the scales below the 
lateral line. 
Head about 4; depth 2.6-2.75; D.11; A. 24-26, scales 6-32 or 33-4.5 
to 5.5; eye equal to interorbital, 2.75-3 in the head. 
Compressed, depth of head at the base of the occipital process 1.5 in the 
greatest depth. Preventral region rounded, without complete series of median 
scales. Predorsal region rounded, with complete median series of ten scales. 
Occipital process about 6 in the distance from its base to the dorsal, bor- 
dered by about 2.5 to 3 scales. Interorbital convex. Second suborbital leaving 
a naked margin behind and below. Maxillary much shorter than the eye, about 
23.5 in the head. Mandible a little longer than the maxillary, not longer than 
the eye. Premaxillary with five large 6- to 8-pointed teeth in the inner row, 
the last smaller than the rest and half hidden behind the one next to it, outer 
row with four 3- to 4-pointed teeth, set so as to coincide with the spaces between 
the first four of the inner series. Maxillary with one very broad, 7- to 8-pointed 
tooth. Dentary teeth large. 
Anal sheath almost obsolete. Lateral line complete or irregularly incom- 
plete, often interrupted. 
Origin of the dorsal equidistant from the snout and caudal; penultimate 
ray 3 in the longest which is 3.5 in the length. Origin of anal on the vertical 
from the first scale behind the dorsal, anal emarginate. Ventrals on the vertical 
* continued. 
Length Left side Totals Right side 
mm. 
62 24+14+6+1+4+1 = 33, 33 = 22+1+8+41+4+1 
51 22 +12 = 34, 34=2 +9 
56 34 = 34, 34 = 34 
62 82 = $2, 338 = 26+1+2+1+6 
59 17+14+84+4+24+1+6 = 33, 383 = 20+5+24+1+46 
65 33 = 338, 34 = 34 
50 @+3+2+4+7+6 = 33, 33 = 33 
64 33 = 33, 32 = 32 
70 10 + 23 = 33, 33 = 10 + 23 
56 10 + 22 = 32, 38 = 14+ 19 
49 16+9+6+2 = 33, 338 = 16+8+2+3+2+4+2 
65 23+1+4+4 = 33, 32=22+1+2+2+4+1 
52 21+1+410 = 32, 32=27+1+4 
Of the specimens from Calamar all but four have the lateral line incomplete. In the specimens 
from the Calamar Cienega the pores are between 7-22 in all but two. In one of the two it lacks but one 
or two scales of being complete, in the other it stutters as in most of the Quibdo specimens. 
‘Largest specimen. 
5 To base of caudal. 
