THE GYMNOTID EELS OF TROPICAL AMERICA. 145 
1907 (Rio Jurua); ErGenmMann, Repts. Princeton Univ. Exp. Patagonia, III, 
1910, 449 (Rio Jurua). 
“Snout produced into a long, nearly straight tube, the length of which equals 
4 times its least depth; mouth very small with several rows of minute teeth; eye 
extremely minute, a little nearer the opercular cleft than the end of the snout. 
Depth of body half length of head; a very strongly developed adipose fin runs 
along the whole length of the body from which it is easily detached; pectoral one- 
third the length of the head; vent under chin; anal 220, originating a little in 
advance of gill-opening, its longest rays more than one-half depth of body; scales 
very small, larger on the upper half of the body than on the lower; lateral line 85. 
Tail in the unique specimen has been injured during life and bears a short regener- 
ated caudal fin. Uniform yellowish white. Total length 400 mm.” 
(From Boulenger. ) 
XII. Srernarcuus Bloch and Schneider. 
Sternarchus BLOCH AND SCHNEIDER, 497, tab. 94. 
Apternotus LAChPEDE, IT, 208. 
Type, Sternarchus albifrons (Linnzus). 
With fontanels; a caudal; snout short; back sealed; gape large; size moder- 
ate, not exceeding 500 mm.; body elongate and compressed; maximum depth and 
thickness in the region of the pectorals; head large, sloping and naked; gape 
straight, long and parallel to the long axis of the body; lower jaw included by the 
fleshy sides of the upper; teeth in two rows in lower jaw, two or more rows or 
patches in upper; eyes small, covered by a membrane. Scales cycloid; lateral 
line complete and quite straight; back scaled; pectorals never equal to more than 
one-half the greatest depth; origin of the anal on or a little in front of the vertical 
from the gill-opening; anal long but not reaching the caudal, of rather uniform 
height; caudal rather small. 
Fig. 12. Sternarchus albifrons (Linneus). 
SPECIES OF STERNARCHUS. 
a. Seales small, 11 to 16 rows above the lateral line. 
b. Snout rather pointed, interorbital distance more than 5 in the head. 
c. Greatest depth of the head 1.25 to 1.5 in its length; interorbital 3 or less than 3 in the snout. 
brasiliensis. 
