120 THE AMERICAN CHARACIDAE. 
half their length; a well-developed axillary scale; lateral line but feebly 
decurved, the rows of scales above it and below it parallel with it. 
Origin of dorsal about equidistant from tip of snout and base of caudal; 
ventrals a little nearer snout, equidistant from tip of snout and end of anal, 
not nearly reaching anal in the types, to the anal in the rest; highest dorsal 
ray four or five in the length; origin of anal under the dorsal or behind the 
last dorsal ray; pectoral not reaching the ventrals. 
A plumbeous lateral band on the row of scales above the lateral line, lost 
in front of the dorsal, becoming dusky behind and continued to the end of the 
middle caudal rays as a faint band; an inconspicuous vertical humeral spot 
just above the third and fourth scales of the lateral line, sometimes crossing 
these. Dorsal and anal dusky. 
Vertebrae 14 + 22. 
Air-bladder in a gravid female small, ending bluntly behind, not curved 
down, but ending at the beginning of the posterior wall of the abdominal cavity; 
posterior part a little more than one and a half times as long as the anterior 
section, its diameter not equal to that of the small eye. 
Alimentary canal very little longer than the body; pyloric coeca very 
large, about seven. Stomach contained insect larvae. 
5. KNopbus VICTORIAE (Steindachner). 
Plate 16, fig. 3. 
Tetragonopterus victoriae SreinDACHNER, Anz. K. akad. wiss. Wien, 1907, 44, p. 83 (Victoria on the 
Parnahyba). 
One specimen, 3751 C. 53 mm. Lagoa Parnagua, Jan. 17, 1908 Haseman 
Head 4.25; depth 3+; D. 10; A. 20 (-22); scales 4.5-36 (to 38)-3.5; 
Eye 2.25-3; interorbital 2.8 in the head. 
Elongate, not greatly compressed, the ventral profile a little more arched 
than the dorsal; preventral and predorsal areas rounded, the latter with twelve 
scales; occipital process very short, about one seventh of the distance between 
its base and the dorsal, bordered by two scales; interorbital rounded, a constric- 
tion between the fontanels. Cheeks entirely covered, maxillary shorter than 
eye; premaxillary with five teeth in the outer series of which the second and 
fourth are entirely withdrawn from the rest; four teeth in the inner series of 
the premaxillary; dentary with three large teeth, similar but much smaller 
ones on the side. 
