Dec. 28, 1916. FisHes of PANAMA— MEEK AND HILDEBRAND. 307 
cc. Orbital margin not free; eye covered by a transparent mem- 
brane. 
d. Teeth wanting; origin of anal about the length of pectoral fin 
behind gill-opening. Hypopomus, p. 309. 
dd. Teeth present in both jaws; origin of anal under or slightly 
behind base of pectorals. Eigenmannia, p. 311. 
bb. Cavdal fin and dorsal filament present; mouth large, its angle 
little, if any, in front of eyes. Sternarchus, p. 312. 
33. Genus Gymnotus Linnezus. 
Co or a , Syst. Nat., Ed. X, 1758, 246 (type Gymnotus carapo 
Size moderate, not exceeding 600 mm. in length. No frontal fon- 
tanel; no caudal fin; a dorsal filament; no electrical organs; 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 is sometimes irregular) in each 
jaw; eyes small and covered by 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 
vertical from the tip of the pectoral. (Ellis.) 
Of this genus only a single widely distributed species is known. 
49. Gymnotus carapo Linnzus. 
Gymnotus carapo Linneus, Syst. Nat., Ed. X, 1758, 246, and Ed. XII, 
1766, 427; Meek, Field Mus. Nat. Hist. Pub., Zodl. Ser., VII, 1907, 
135 (Los Amates and Lake Amatitlan, Guatemala); Ellis, Memoir. 
Carnegie Mus., VI, 1913, 117 (Guatemala, south to the Rio de la 
Plata and the West Indies). 
Gymnotus fasciatus Pallas, Spicil. Zool., VII, 1769, 35; Schomburgk, 
Fishes of Guiana, 1843, 184, Pl. 19 (Rio Branco). 
Gymnotus albus Pallas, Spicil. Zool., VII, 1769, 36 (Surinam). 
Gymnotus brachyurus Bloch, Syst. Ichthyol. 1787, Taf. 157, fig. 1. 
Gymnotus putaol Lacépéde, Hist. Nat. Poiss., II, 1800, 176. 
Carapus fasciatus Cuvier, Régne Animal, Ed. I, II, 1817, 237. 
Carapus brachiurus Cuvier, Régne Animal, Ed. I, II, 1817, 237. 
Carapus inequilabiatus Valenciennes, in d’Orbigny, Voy. Amér. Mérid., 
V, Pt. 2, 1847, 11, Pl. 14 (La Plata). 
Giton fasciatus Kaup, in Dumeril, Analyt. Ichthyol., 1856, 201; Jordan 
& Evermann, Bull. U. S. Nat. Mus., XLVII, 1896, 340 (Guatemala 
to Rio de la Plata). 
