THE GYMNOTID EELS OF TROPICAL AMERICA. 131 
7. Eigenmannia troscheli (Kaup). (Plate XXII, fig. 2.) 
Sternopygus troscheli Kaur, Apod., 139, 1856; SreinpaAcHNER, Die Gymnotide, 
12, 1868 (Barra do Rio Negro); Giwnruer, Cat., VIII, 8, 1864; Corr, Proc. 
Am. Philos. Soe., 1878, 682 (Peruvian Amazon); STernpacuNner, Fisch-f. 
Magd., 56, 1878 (note); ErGENMANN AND EIGENMANN, Proc. U.S. Nat. Mus., 
XIV, 1891, 62. 
Higenmannia troscheli EIGENMANN AND Warp, Proc. Wash. Acad. Sci., Vol. VII, 
174, 1905 (Amazonas from Manaos to Peru); KIGENMANN AND BEAN, Proc. 
U. 8. Nat. Mus., Vol. 31, 666, 1907 (Lower Amazon); VON IneRING, Os 
Peixes do Brazil, Part 1 A, 1907; Eraenmann, Repts. Princeton Univ. Exp. 
Patagonia, III, 1910 (Amazons, from Manaos to Peru). 
Sternopygus axillaris Gtinruer, Cat., VIII, 8, 1864 (Para); ErGenMANN AND 
EIGENMANN, Proc. U. 8. Nat. Mus., XIV, 1891, 62. 
Kigenmannia axillaris EIGENMANN AND Warp, Proc. Wash. Acad. Sci., Vol. VII, 
1905, 174 (Para). 
Fic. 5. Higenmannia 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. 
