. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Eigenmann: The and Mylin/e. 255 Serrasalmo rhombeus Lacepede, Hist. Nat. Poiss., Vol. V, 1804, p. 284; Cuvier, Mem. Mus. d'Hist. Nat., Vol. V, 1819, p. 367; Cuvier & Valenciennes, Hist. Nat. Poiss., Vol. XXII, 1848, p. 272 (Araguay); Muller & Troschel, in Schomburgk. Reisen, Vol. Ill, 1848, p. 637 (Rupununi, Takutu); Castelnau. Anim. Amer. Sud, Poiss., 1855, pi. 37, fig. 3; Gunther, Cat. Fishes Brit. ; Vol. V, 1864, p. 369 (Essequibo, Surinam, Demerara); Eigenmann
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Eigenmann: The and Mylin/e. 255 Serrasalmo rhombeus Lacepede, Hist. Nat. Poiss., Vol. V, 1804, p. 284; Cuvier, Mem. Mus. d'Hist. Nat., Vol. V, 1819, p. 367; Cuvier & Valenciennes, Hist. Nat. Poiss., Vol. XXII, 1848, p. 272 (Araguay); Muller & Troschel, in Schomburgk. Reisen, Vol. Ill, 1848, p. 637 (Rupununi, Takutu); Castelnau. Anim. Amer. Sud, Poiss., 1855, pi. 37, fig. 3; Gunther, Cat. Fishes Brit. ; Vol. V, 1864, p. 369 (Essequibo, Surinam, Demerara); Eigenmann & Eigen" MANN, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 60; ? Boulenger, Ann. Mus. Civ. Stor. Nat. Geneva, Sen 2, Vol. XIX, 1898 (Puerto 14 Mayo); Eigenmann, Reports Princeton Univ. Exp., Patagonia, Vol. Ill, 1910, p. 442;—Memoirs Carnegie Vol. V, 1912, p. 382 (Wismar, Crab Falls, Packeoo, Twoca Pan, Tumatumari, Rockstone).. Fig. 7. Dentition of Serrasalmo rhombeus (Linnaeus). (Somewhat enlarged.) Serrasalmo albus Valenciennes in Humboldt, Recherches Poissons Fluv. Rec. d'Observ. Zoologie, Vol. Ill, 1821, p. 173, pi. 47, fig. i (Orinoco). Serrasalmo caribe Cuvier & Valenciennes, Hist. Nat. Poiss., Vol. XXII, 1849, p. 279. Serrasalmo immaculatus Cope, Proc. Amer. Philos. Soc, 1878, p. 692 (Peruvian Amazon); Eigenmann & Eigenmann, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 60; Fowler, Proc. Acad. Nat. Sci. Phila., 1906, p. 471, fig. 54 (Peruvian Amazon, notes on the types); Eigenmann, Reports Princeton Univ. Exp. Patagonia, Vol. Ill, 1910, p. 442. Distrihutioii.—Guianas and Amazons. The type of immaculatus figured by Fowler shows it to be a rhombeus. It is possible that the smaller cotypes are humeralis. The S. albus is said to difTer in having twenty dorsal rays. I have found nineteen in one specimen of rhombeus and until we find a species in the Orinoco with the characters assigned to albus, differing from rhombeus, albus may be put as a synonym of r
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