74 PROCEEDINGS OF THE NATIONAL MUSEUM vol.99 



anal rays, 137 to 146, instead of more than 190 as well as in its colora- 

 tion. In addition, there are two irregular rows of teeth on each side 

 of the lower jaw instead of a single row in the other species. This 

 tooth character may be of significance generically. The following key 

 may be used to identify the species referred to Stemarchogiton: 



la. Anal rays about 197 or 200; sides of lower jaw with a single row of teeth; no 

 pale streak along middorsal line. 

 2a. Head about 12 in length; eye about 3J4 in the head. 



S. nattereri (Steindachner) 



26. Head about 9 in length, eye 7 in snout; posterior half of pectoral rays dark 



and distal part of anal rays blackish.S. porcinum Eigenmann and Allen 



lb. Anal rays 137 to 146; 2 rows of short conical teeth on sides of lower jaw; 



middorsal hue of back with pale streak anteriorly; pale blotch on chin; 



head 8 to 9 in total length; eye 3 to 3 >4 in snout; fins all pale in color. 



S. cuchillejo, new species 



Some of the females have pale amber-colored eggs in their ovaries 

 and appear to be nearly ready to spawn. 



Named cuchillejo for the popular name of this small knife-shaped 

 fish. 



Genus ADONTOSTERNARCHUS Ellis 



Adontosternarchus Ellis, Mem. Carnegie Mus., vol. 6, No. 3, p. 155, 1913. (Gen- 

 otype, Sternarchus sachsi Peters.) 



ADONTOSTERNARCHUS SACHSI (Peters) 



Fez Cuchillo de las Llanos 



Sternarchus sachsi Peters, Monatsb. Akad. Wiss. BerHn, 1877, p. 473 (San Fer- 

 nando de Apure, Venezuela). — Sachs, Aus den Llanos, 1879, pp. 153, 367, 

 fig. on p. 279 (Apure). — Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., 

 vol. 14, p. 62, 1891 (Apure). — Eigenmann and Allen, Fishes of western 

 South America, p. 326, 1942 (Orinoco) — Rohl, Fauna descriptiva de Vene- 

 zuela, p. 377, fig. 189, 1942 (Orinoco). 



Stemarchogiton sachsi Eigenmann and Ward, Proc. Washington Acad. Sci., vol. 

 7, p. 165, 1905 (Orinoco). 



Family GYMNOTIDAE 



Genus GYMNOTUS Linnaeus 



Gymnoius Linnaeus, Systema naturae, ed. 10, p. 246, 1758; ed. 12, vol. 1, 

 p. 427, 1766. (Genotype, Gymnotus carapo Linnaeus.) 



GYMNOTUS CARAPO Linnaeus 



Gimnoto 



Gymnotus carapo Linnaeus, Systema naturae, ed. 10, p. 246, 1758. — Eigenmann, 

 Indiana Univ. Stud., vol. 7, No. 44, p. 12, 1920 (Maracay, Rio Bue, Vene- 

 zuela). 



Carapus fasciatus Pellegrin, Bull. Mus. Hist, Nat. Paris, vol. 5, p. 157, 1899 

 (Apure River, Venezuela). 



