EIGENMANN: the freshwater fishes of BRITISH GUIANA 425 



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 a uniform dark blue, lighter ventrally; fins much darker and 

 fringed (especially the pectorals) with white. 



Subfamily Gymnotin^. 

 Gymnotus Linnaeus. 

 Gymnotus Linn^us, Syst. Nat., ed. 10, I, 1758, 246 {carapo). 

 Carapus Cuvier, Regne Animal, II, 1817, 237. 

 Giton Kaup, in Dumeril, Analyt. Ichth., 1856, 201. 



Type, Gymnotus carapo Linnaeus. 



No frontal fontanel; anal basis not extending around the end of the tail, which is 

 cylindrical and terminal; body scaled; teeth conical, in one row in each jaw. No 

 electric organs. 



But a single species of this genus is known, which, however, is the most widely 

 dispersed Gymnotid, ranging from Central America over most of South America 

 east of the Andes. 



271. Gymnotus carapo Linnseus. 

 "Carapo" Marcgrave, Hist. Rer. Nat. Bras., 1648, 170. 

 Gymnotus carapo Linnaeus, Syst. Nat., ed. 10, I, 1758, 246. — Eigenmann, Repts. 



Princeton Univ. Exp. Patagonia, III, 1910, 450. 

 Gymnotus fasciatus Pallas, Spic. Zool., VII, 1769, 35. — Schomburgk, Fishes Brit. 



Guiana, II, 1842, 174, pi. 19. 

 Carapus fasciatus Cuvier, Regne Animal, II, 1817, 237. — Steindachner, "Die 



Gymnotidffi," 1868, 13 (Surinam).— GtJNTHER, Catalogue, VIII, 1870, 9 



(Surinam and British Guiana). 

 Giton fasciatus Kaup, in Dumeril, Analyt. Ichth., 1856, 201. — Eigenmann and 



Ward, Proc. Wash. Acad. Sci., VII, 1905, 177. 

 Gymnotus albus Pallas, Spic. Zool., VII, 1769, 36 (Surinam). 

 Carapus albus Kaup, Cat. Apod. Fish, 1856, 140 (French Guiana). 

 Gymnotus hrachiurus Block, Ausl. Fische, II, 1786, 61, pi. 157, fig. 1. 

 Gymnotus putaol Lacepede, Hist. Nat. Poiss., II, 1800, 176. 

 Carapus brachyurus Cuvier, Regne Animal, II, 1817, 237. 

 Carapus incequilabiatus Valenciennes, in d'Orbigny, Voy. Am. Mer., V, ii, 1847, 



pi. 14. 



Thirty-four specimens, 80-435 mm. Holmia. (C. M. Cat. No. 1776a-e; 

 I. U. Cat. No. 12622.) 



