116 MEMOIRS OF THE CARNEGIE MUSEUM. 



Vol. 55, 508, 1897 (Waini River, Brit. Guiana); von Ihering, Revista Mus. 

 Paulista, 286, 1907 (Amazonia, Guyana); Eigenmann, Repts. Princeton 

 Univ. Exp. Patagonia, III, 1910, 449. 

 Gijmnotus regius Delle Chiaje, N. Ann. Sc. Nat. Bologna, VIII, 1847. 



1302 C. M., three, 650 to 825 mm. Tumatumari, Brit. Guiana, Eigenmann. 



1754 C. M., 12635 I. U. M., three, 190-580 mm. Creek below Potaro Landing, 

 Brit. Guiana, Shideler. 



1755 C. M., one, 460 mm. Pacopoo Pan, Brit. Guiana, Grant. 

 5100 I. U. M., one, 330 mm. Brazil. 



One specimen, Hubabu Creek, Brit. Guiana, Oct. 1, 1910, Ellis. 



Head 8 to 9.2; depth 14.5 to 16 in the length to the end of the anal; anal rays 

 357, 362, 324, in three specimens. Snout about 3.5, interorbital a little less, in 

 the head; eye 5 to 5.2 in the snout, and 15 or 16 in the head. 



Body cylindrical, elongate, naked; head depressed; width of the head about 

 equal to, and depth a little less than, the greatest depth of the body; anus a little 

 more than the length of the snout behind the vertical from the eye in front of the 

 pectorals; ventral and dorsal profile almost straight. 



Snout heavy and broad; mouth large; gape moderately long, but not quite 

 reaching to below the eye; lower jaw protruding; teeth small, conical, a single 

 row in each jaw; eyes small, without free orbital margin. 



Origin of the anal about the length of the head behind the pectorals; anal fin 

 of uniform width and continuing around the end of the tail so as to form a false 

 caudal; pectorals small, fan-shaped, 2.8 to 3.5 in the head. 



Ground-color in life olive-green or dark blue to almost black; ventral parts 

 of head and pectoral region light yellow to orange-red; fins dark, fringed with 

 hyaline. 



This species is occasionally used for food by the Indians. It is rather .gener- 

 ally avoided by the natives on account of the powerful electric shock it can give, 

 that of an eel five feet long being sufficient to knock a man down. 



The maximum size for this species, recorded from British Guiana, is seven 

 feet four inches. This specimen was taken by Mr. J. J. Quelch from the Waini 

 River, British Guiana, in 1897, and the skin is now in the Georgetown Museum. 



Habitat: Pools and deeply shaded places in small streams and creeks. 



Distribution: Orinoco, Guianas, and the Lower and Middle Amazon Systems. 



II. Gymnotus Linnseus. 



Gymnotus Linn^us, Syst. Nat., ed. X, 246, 1758; ed. XII, 1, 427, 1766. 



Type, Gymnotus carapo Linnseus. 



Size moderate, not exceeding 600 mm. in length. No frontal fontanel; no 

 caudal fin; a caudal filament, no electrical organ; cylindrical anteriorly, somewhat 

 compressed posteriorly; head large and depressed, the top quite flat; gape not 

 reaching the eyes; lower jaw protruding; teeth small, conical, in one row (which 



