THE GYMNOTID EELS OF TROPICAL AMERICA. 145 



1907 (Rio Jurua); Eigenmann, 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. Sternarchus Bloch and Schneider. 



Sternarchus Block and Schneider, 497, tab. 94. 

 Apternotus Lacepede, II, 208. 



Type, Sternarchus albifrons (Linnseus). 



With fontanels; a caudal; snout short; back scaled; 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 {Linnxua) . 



Species of Sternarchus. 



a. Scales small, 11 to 16 rows above the lateral Une. 



6. 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. 



