ICHTHYOLOGY OF VENEZUELA — SCHULTZ 69 



26. Anal fin rays blackish except posteriorly, which may be white; snout 

 elongate, equal to three-fourths to four-fifths length of pectorals and 

 about 3 times in greatest depth; depth of head at occiput lys in its length; 

 rear of eye in front of middle of head by more than the distance between 

 the anterior and posterior nostrils or the width of interorbital space; a 

 more or less interrupted white band from snout tip to top of head; a 

 broad band encircling body and anal fin near rear of latter on specimens 

 shorter than 200 mm. total length and on those larger this white band 

 becoming mottled and broken up with black blotches, while in specimens 

 300 mm. or longer only a trace remaining as a white blotch or so on the 

 anal fin, or it may be lacking; anal rays 176 to 197. 



Apteronotus cuchillo, new species 



APTEKONOTUS ALBIFRONS (Linnaeus) 



Cuchillo 



Gymnotus albifrons Linnaeus, Systema naturae, ed. 12, vol. 1, p. 428, 1766 (ref. 

 copied). 



Sternarchus albifrons Peters, Monatsb. Akad. Wiss. Berlin, 1877, p. 473 (Rio 

 Apure, Venezuela). — Sachs, Aus den Llanos, 1879, p. 279 (Apure). — Eigen- 

 MANN AND EiGENMANN, Proc. U. S. Nat. Mus., vol. 14, p. 61, 1891 (Apure). — 

 EiGENMANN AND Ward, Proc. Washington Acad. Sci., vol. 7, p. 163, fig. 2, 

 1905 (Orinoco). — Ihering, Rev. Mus. Paulista, vol. 7, p. 273, 1907 (Guianas, 

 Venezuela, Ecuador, Rfo Amazon to Peru and Rfo Paraguay). 



Apteronotus albifrons Eigenmann and Allen, Fishes of western South America, 

 p. 321, 1942 (Orinoco). 



apteronotus LEPTOEHYNCHUS 14 (Eigenmann) 



Sternarchus leptorhynchus Eigenmann, Mem. Carnegie Mus., vol. 5, p. 439, 1912 

 (Amatuk; Warraputa). 



U.S.N.M. No. 121595, 10 specimens, 103 to 178 mm. in total length, Rfo San 

 Juan near bridge south of Mene Grande, tributary of Rio Motatdn, March 17 

 and 20, 1942. 



U.S.N.M. No. 121593, 3 specimens, 94 to 151 mm., Rfo San Pedro at bridge 

 south of Mene Grande, Motatdn system, March 20, 1942. 



U.S.N.M. No. 121594, a specimen, 43 mm., Rfo Negro below mouth of Rfo 

 Yasa, March 2, 1942. 



U.S.N.M. No. 121592, a specimen, 57.5 mm., Rfo San Juan, 12 km. south of 

 Rosario, February 26, 1942. 



APTERONOTUS CUCmLLO. new species 



Plate 3, A 

 Pez Cuchillo 



Holotype.—U.S.'NM. No. 121591, 363 mm. in total length, 350 

 mm. to base of caudal fin and 330 mm. to end of anal fin, collected by 

 Leonard P. Schultz in the Rio Socuy, 3 km. above mouth, February 

 24, 1942. 



Paratypes. — All paratypes were collected by Leonard P. Schultz 

 during 1942 in the Maracaibo Basin of Venezuela: 



» This species has been reported from the Orinoco Basin at Guaicaramo, Colombia, and from the RIos 

 Calima, Saija, and Dagua, western Colombia. 



