252 Annals of the Carnegie Museum. 



2.7 in the distance from its base to the dorsal; palatines with five 

 well developed teeth; about one-third of the cheek naked at its widest. 



Serrae well developed; dorsal elevated in front; anal slightly emargi- 

 nate in front; ventrals about 2 in the head without the opercle, equal 

 to the longest anal ray. 



Sides with numerous circular spots about the size of the pupil; 

 an angular humeral spot, larger than the other spots; a V-shaped 

 basal caudal spot; anal and distal portion of caudal hyaline. 



18. Serrasalmo aesopus Cope. 



Serrasalmo cesopus Cope, Proc. Acad. Nat. Sci., Phila., 1871, p. 269 (Amazon be- 

 tween Rio Negro and the Huallaga); Eigenmann & Eigenmann, Proc. U. S. 

 Mus., Vol. XIV, 1891, p. 60; Fowler, Proc. Acad. Nat. Sci., Phila., 1906, p. 469, 

 fig- 53 (note, and figure of the type from the Amazon between Rio Negro and Hual- 

 laga); Eigenmann, Reports PrincetonUni v. Exp. Patagonia, Vol. Ill, i9io,p. 442. 



Distribution. — Upper Amazon. 



This species is known only from the type, five and seven-eighths 

 inches long, in the collection of the Philadelphia Academy. It may 

 prove to be synonymous with spilopleiira. 



19. Serrasalmo spilopleura Kner. (Plate XLIX.) 



Serrasalmo spilopleura Kner, Characinen, Vol. II, 1859, p. 35, taf. v-, fig. ii (Matto 

 Grosso, Guapore, ? Bogota); Gijnther, Cat. Fishes Brit. Mus., Vol. V, 1864, 

 p. 370 (River Capin); Ann. & Mag. Nat. Hist., 1880, p. 13 (La Plata); Eigen- 



FiG. 5. Dentition of Serrasalmo spilopleura Kner. -f-. 



MANN & Eigenmann, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 60; Ulrey, 

 Ann. N. Y. Acad. Sci., Vol. VII, 1895, p. 297 (Tocantins, Brazil); Perugia, 

 Ann. Mus. Civ. Stor. Nat. Geneva, Ser. 2, Vol. VIII, 1897, p. 26 (Bolivia); 

 BouLENGER, Trans. Zool. Soc. London, Vol. XIV, 1896, p. 37 (Descalvados and 



