208 THE AMERICAN CHARACIDAE. 
Origin of dorsal equidistant from snout and base of the caudal, penulti- 
mate ray 2.5 in the longest which is 4 in the length. Origin of anal on the 
vertical from the last dorsal ray; anal emarginate, its longest ray 2 in the length 
of the base. Ventrals on the vertical from between the first and second scales 
in front of the dorsal. Ventrals barely or not quite reaching the anal; pectorals 
almost reaching ventrals. 
Caudal spot dark, sometimes reaching the tips of the middle caudal rays, 
continued forward as a black stripe which is (except in formalin specimens) 
overlaid with the broad silvery lateral band. Humeral spot large, very distinct, 
usually elongate vertically, the larger upper part surrounded by light in front 
and behind. All scales below the second series above the lateral line iridescent. 
The four scales between the upper end of the humeral spot and the head are 
bluish iridescent. Anal and dorsal a little dusky. 
Five specimens 20895 and 20893 in part, 33-39 mm. (Muriahe, Hartt, and 
Copeland), are probably a variety of H. liitkeni. They differ from the type as 
follows :— 
Head 3-3.33, anal 22-26, scales 6-31 to 33-5.5, eye 2:5 in the head, inter- 
orbital 3. 
Predorsal region with 11 scales in the complete median series. 
Occipital process 5 in the distance from its base to the dorsal. Maxillary 
widest near its tip, instead of in its middle portion, as in typical specimens. Pre- 
maxillary with five 5- to 7-pointed teeth in the inner and two or three tricuspid 
ones in the outer row. Maxillary with two 6- to 7-pointed teeth which are some- 
what chisel-shaped. 
Ventral just reaching the anal, pectorals reaching half the length of the 
eye beyond the base of the ventrals. 
Caudal spot continued to the end of the middle caudal rays. Humeral 
spot very faint. 
The specimens from the Paraguay Basin have the caudal spot very heavy 
and extending band-like over the full width of the peduncle. 
27. HYPHESSOBRYCON RETICULATUS Ellis. 
Plate 29, fig. 2. 
Hyphessobrycon reticulatus Exuis, Ann. Carnegie mus., 1911, 8, p. 153, pl. 2, fig. 2 (Campos). 
HasiraT.— Southeastern Brazil. 
