312 FISHES OF WESTERN SOUTH AMERICA 
Cope, 1871 (1872), Proc. Acad. Nat. Sci. Phila., XXIII, 258, Rio Ambyiacu; 
Eigenmann and Eigenmann, 1891, Proce. U.S. Nat. Mus., XIV, 48; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 424. 
Guianas and Amazonia 
A species belonging to the lower Amazon, and, fide Cope, to the upper stream. 
Innes, the Aquarium, May, 1932, has an excellent photograph of a 31-inch speci- 
men from life. 
433. PROCHILODUS RUBROTAENIATUS Schomburgk 
Prochilodus rubrotaeniatus Schomburgk, 1841, Fish. Brit. Guiana, I, 258, pl. xxviii; 
Eigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 48; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 424; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 270. 
Guianas, Rio Negro, upper Amazons 
—, 1, 204 mm., Iquitos, Allen, December, 1920. 
434. PROCHILODUS CAUDOFASCIATUS Starks 
Prochilodus caudofasciatus Starks, 1906, Proc. U.S. Nat. Mus., XXX, 773; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 424. 
Rio Perené 
Order GLANENCHELI 
Gymnonoti Jordan, Evermann, and Clark, 1928 (1930), Rept. U.S. Comm. Fish., Part II, 101. 
Family XII: Gymnotidae 
Gymnotidae Eigenmann and Ward, 1905, Proc. Wash. Acad. Sei., VII, 159-188; 
Ellis, 1918, Mem. Carnegie Mus., VI, 109-195, pls. xv—xwiii. 
KEY TO THE SUBFAMILIES OF THE GYMNOTIDAE 
(A revision of the keys in Eigenmann, 1912, and Ellis, 1913) 
a. Large frontal and parietal fontanels; mandible not prolonged; head not depressed (except 
Rhabdolichops) 
b. No caudal fin; tail extending beyond anal fin, slender, pointed; no dorsal filament 
c. Snout short, not tubular. SFC TE ccc Cz ECR (a AP er STERNOPYGINAE 
ee. Snout tubular, very much compressed and e longate fishes... RHAMPHICHTHYINAE 
bb. With caudal fin; tail short; dorsal filament presenta). <bean: APTERONOTINAE 
aa. No frontal fontanel; mandible projecting; head more or less depressed 
d. Anal basis extending around end of tail, forming a false caudal fin; electric organs 
present sbodyvenotmscaledt- ware: no era siren ee eee ELECTROPHORINAE 
dd. Anal basis not extending around slender, “eylindrical tail; no electric organs; body 
(ers) (16 Lace ee en Rte Om VC aa Seal CGE REA Ri We he, Jn aa SG FYMNOTINAE 
Subfamily: STERNOPYGINAE 
KEY TO THE GENERA OF THE SUBFAMILY STERNOPYGINAE 
a: Orbital smarem trees both jaws. withiteethiee sy. nese nic) ss eee eens, STERNOPYGUS 
aa. Orbital margin not free 
