THE GYMNOTID EELS OF TROPICAL AMERICA. aly 
is sometimes a little irregular) in each jaw; eyes small and covered by a membrane, 
without free orbital margin; scales cycloid and very small; lateral line complete 
and paralleling the main axis of the body; pectorals small; anal long, its origin 
back of the vertical from the tip of the pectoral. 
A genus of a single species. 
Fie. 2. Gymnotus carapo Linneus. 
2. Gymnotus carapo Linneus. 
Carapo Marce., Hist. Pisc., 170; WiLLoucuBy, Hist. Pisc., 115, tab. G 7, fig. 4. 
Gymnotus Sepa, Thesaur., III, tab. 32, fig. 1. 
Gymnotus carapo Linnzus, Syst. Nat., ed. X, 246, 1758; idem, ed. XII, i, 427, 
1766; Buiocu, V, 59, tab. 157, fig. 2; Gronow, Syst., ed. Gray, 22, 1854; 
Giuu, Proce. Acad. Nat. Sci., Phila., 151, 1864; Mitimr, Bull. Am. Mus. Nat. 
Hist., Vol. XXIII, 1907 (Los Amates and Puerto Barrios, Guatemala); 
KIGENMANN AND BkEaN, Proc. U.S. Nat. Mus., Vol. 31, 666, 1907 (Amazon); 
Merk, Bull. Field Mus. (Zool. Series Pub. No. 124), Vol. VII, No. 5, 1907 
(Los Amates and Lake Amatitlan, Guatemala); idem, Bull. Field Mus. (Zool. 
Ser. Pub., 127), Vol. VII, No. 6, 1908 (Lake Amatitlan, Guatemala). 
Gymnotus fasciatus PALLAS, Spicil. Zool., VI, 35; ScHomBuraks, Fishes of Guiana, 
184, pl. 19, 1848 (Rio Branco). 
Carapus fasciatus Cuvier, Régne Animal, ed. I, 237, 1817; MULLER AND TROSCHEL, 
Hore Ichthyol., III, 18, 1849; Castetnau, Anim. Amer. Sud., 85, 1855 
(Amazon); Kaup, Apod., 139, 1856; SrernpacHNER, Die Gymnotide, 13, 
1868 (Caicgara, Cuyaba, Marabitanos, Surinam, Matto Grosso); GUnrTHeEr, 
Cat., VIII, 9, 1870 (Capim, Bahia, Surinam, British Guiana, Essequibo, 
Berbice, Trinidad, Is. Grenada, Rio Motagua); HENsEL, Wiegm. Archiv, 
89, 1870 (Guahyba, Porto Alegre); Copr, Proc. Am. Philos. Soc., 1870, 570 
(Pebas); Corr, Proc. Acad. Nat. Sci. Phila., 1871 (1872), 257 (Ambyiacu); 
LUrKEN, Velhas Flodens Fiske, 247, and XIX, 1874 (Rio das Velhas; Lagoa 
Santa and Rio San Francisco); Cops, Proe. Am. Philos. Soc., 1878, 682 
(Peruvian Amazon); BouLENGER, Proc. Zool. Soc., 1887, 282 (Canelos); 
EIGENMANN AND EIGENMANN, Proc. U.S. Nat. Mus., XIV, 1891, 62; Perueta, 
