Eigenmann: The Serrasalmin.e 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. Mus.> 

 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 Mus.. 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 rhombeus. 



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