118 THE AMERICAN CHARACIDAE. 
much greater than the length of the snout, three and a half in the head; lower 
jaw two and three fourths in the head; uniformly four teeth in the inner series 
of the premaxillary, six of the specimens from Tabatinga with four, two with 
five in the outer series, the second and sometimes the third removed from the 
line of the first and fourth; lower jaw with only three or three and a half large 
teeth in front and several small ones on the sides; two of the maxillaries of 
the left side of specimens from Tabatinga with one, four with three, one with 
four and one with five teeth. 
Gill-rakers about 6 + 9, very minute, the longest about one seventh of the 
diameter of the eye. 
Seales closely imbricate, with four to six diverging striae; a well-devel- 
oped anal sheath of about two rows of scales; caudal lobes scaled for about 
one third their length, the scales caducous; lateral line slightly decurved, 
parallel with the row of scales below it. 
Origin of dorsal equidistant from tip of snout and base of caudal, or slightly 
nearer the latter; origin of the ventrals nearer the tip of the snout by a space 
equal to or greater than the diameter of the eye, equidistant from tip of snout 
and base of last anal ray; highest dorsal ray one fifth of the length; anal emargi- 
nate, its origin equidistant from tip of snout and second third of dorsal; ven- 
trals scarcely reaching to anal, pectorals usually not quite to origin of ventrals. 
An ill-defined silvery lateral band or if dissolved a band of scattered chroma- 
tophores from the eye to the base of the caudal, the cells sometimes concen- 
trated to form a vertical, humeral spot crossing the lateral line. Vertebrae 
13 + 23. 
In the types of K. moenkhausii the caudal sheath of scales apparently 
is not as well developed as in the specimens from Tabatinga. The lateral 
color-band is less well developed. I am not able to make out other differences 
with the material at hand. 
4. Kwnopus BREvicEps (Kigenmann). 
Plate 10, fig. 2. 
Bryconamericus breviceps EIGENMANN, Bull. M. C. Z., 1908, 62, p. 105 (Goyaz); Rept. Princeton univ. 
exped. Patagonia, 1910, 3, p. 434. 
Hasirat.— Amazon Basin. 
