Eigenmann: The Serrasalmin.e and Mylin/E. 239 



Distribution. — Guiana, Amazons, Rio San Francisco, (and to 

 Paraguay?). 



As far as known this genus contains one species, the type. I am 

 not sure whether all of the references cited in the synonymy below 

 really belong to this species. My identification of specimens from 

 Guiana as belonging to this species was wrong. 



4. Pygocentrus piraya Cuvier. (Plate XLIV.) 



Piraya Marcgr., Nat. Hist. Bras., 1648, p. 164. 



Serrasalmo piraya Cuvier, Mem. Mus. Paris, Vol. V, 1819, p. 368, pi. 28, fig. 4; 

 GtJNTHER, Cat. Fishes Brit. Mus., Vol. V, 1864, p. 368 (Brazil; River Cupai; 

 Demerara); Cope, Proc. Am. Philos. Soc, Phila., Vol. XI, 1869-70, p. 566 

 (Para); Steindachner, Flussfisch. Sudam., Vol. II, 1881, p. 13 (Teffe, Rio 

 Puty); Perugia, Ann. Mus. Civ. Storia Nat., Geneva, Ser. 2a, Vol. X, 1891, 

 p. 51 (Villa Maria, Matto Grosso, Rio Paraguay). 



Pygocentrus piraya MiJLLER & Troschel, Horae Ichthyol., Vol. I., 1845, p. 20; 

 Cuvier & Valenciennes, Hist. Nat. Poiss., Vol. XXII, 1848, p. 291; MOller 

 & Troschel, in Schomburgk, Reisen, Vol. Ill, 1848, p. 636 (Brit. Guiana); 

 ? Castelnau, Anim. Amer. Sud Poiss., 1855, p. 72, pi. 38, fig. 2 (Goyaz; 

 Amazon); Kner, Characinen, Vol. II, 1859, p. 28; Eigenmann & Eigenmann, 

 Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 59; Ulrey, An. N. Y. Acad. Sci., 

 Vol. VII, 1895, p. 297 (Trocera on Tocantins). Fowler, Proc. Acad. Nat. Sci., 

 Phila., 1906, p. 468 (Para); Eigenmann, Reports Princeton Univ. Exp. Pata- 

 gonia, Vol. Ill, 1910, p. 442. 



Serrasalmo {Pygocentrus) piraya LDtken, Velhas-Flodens Fiske, 1875, p. 233, and 

 p. xvii (Rio das Velhas). 



Serrasalmo piranha Agassiz, Selecta Genera et Spec. Pise. Bras., 1829, p. 71, tab. 

 28 (Rio San Francisco); Schomburgk, Fish. Brit. Guiana, Vol. I, 1841, p. 221, 

 pi. xvi (Rio Branco). 



1 Serrasalmo nigricans Agassiz, Selecta Genera et Spec. Pise. Bras., 1829, p. 72, 

 tab. 30. 



? Pygocentrus nigricans Muller & Troschel, Horae Ichthyol., Vol. I, 1845, p. 21. 



Pygocentrus bidorsalis Natterer, MS. in Kner, Characinen, Vol. II, 1854, p. 28. 



Distribution. — Guiana, Amazon to Rio das Velhas, and ?Paraguay. 

 It is probable that Perugia's record is for R. nattereri. 



5698 a-b. C. M. 35-43 mm. Santa Rita, Jan. 24, 1909. Haseman. 

 5696 a. C. M. 60 mm. Barreiras, Lagoas of Rio Grande, Jan. 3-4* 



1907. Haseman. 



6521 o-g. C. M. i8-about240 mm. Penedo, May 20, 1908. Haseman. 



5699 a-h. C. M. Largest 44 mm. Boqueirao, near mouth of Rio 

 Preto, Jan. 6, 1908. Haseman. 



6522 a-c. C. M. 108-202 mm. Joazeiro, Nov. 28, 1907. Haseman. 



6523 a. C. M. 122 mm. Rio das Velhas, May 11, 1908. Haseman. 



6524 a. C. M. 190 mm. Lagoa de Porto, Dec. 24, 1907. Haseman. 





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