THE GYMNOTID EELS OF TROPICAL AMEKICA. 131 



7. Eigenmannia troscheli (Kaup). (Plate XXII, fig. 2.) 



Sternopygus troscheli Kaup, Apod., 139, 1856; Steindachner, Die Gymnotidse, 



12, 1868 (Barra do Rio Negro); Gunther, Cat., VIII, 8, 1864; Cope, Proc. 



Am. Philos. Soc, 1878, 682 (Peruvian Amazon); Steindachner, Fisch-f. 



Magd., 56, 1878 (note); Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., 



XIV, 1891, 62. 

 Eigenmannia troscheli Eigenmann and Ward, Proc. Wash. Acad. Sci., Vol. VII, 



174, 1905 (Amazonas from Manaos to Peru); Eigenmann and Bean, Proc. 



U. S. Nat. Mus., Vol. 31, 666, 1907 (Lower Amazon); von Ihering, Os 



Peixes do Brazil, Part 1 A, 1907; Eigenmann, Repts. Princeton Univ. Exp. 



Patagonia, III, 1910 (Amazons, from Manaos to Peru). 

 Sternopygus axillaris Gijnther, Cat., VIII, 8, 1864 (Para); Eigenmann and 



Eigenmann, Proc. U. S. Nat. Mus., XIV, 1891, 62. 

 Eigenmannia axillaris Eigenmann and Ward, Proc. Wash. Acad. Sci., Vol. VII, 



1905, 174 (Para). 



Fig. 5. Eigenmannia troscheli (Kaup). 



3164 C. M., three, 100-180 mm. San Joaquim, Sept. 5, 1909, Haseman. 



Head 7.25 to 8, greatest depth 6.25 to 7.25 in the length to the end of the anal; 

 anal rays 210, 220, 224. 



Snout 3.75 to 4, interorbital 3 to 3.75 in the head; eye 2 or a little more in the 

 snout, not quite 2 in the interorbital, 8 or 9 in the head. 



Body compressed; head chubby; width of the head 2.25 to 2.5, depth of the 

 head in the occipital region 1.25 to 1.4 in the greatest depth of the body; anus 

 little behind the vertical from the posterior margin of the eye; dorsal profile weakly 

 convex; ventral profile distinctly convex in the pectoral region. 



Snout blunt and broad; mouth small; gape quite short, not equalling the 

 diameter of the eye in length; maxillary long, equal to twice the diameter of the 

 eye; jaws about equal, the lower projecting slightly, if at all; teeth in four or five 

 rows around the edge of each jaw, villiform and curved inward slightly. 



Caudal peduncle 3.25 to 3.6 in the total length; pectorals 1 to 1.2 in the head; 

 origin of the anal just below the origin of the pectorals. 



