256 Annals of the Carnegie Museum. 



5784 a. C. M. 174 mm. to end of lateral line. Manaos, Nov. 15, 

 1909. Haseman. 



5785 a-b. C. M. 205 mm. Santarem, Dec. 1 1, 1909. Haseman. 

 5793 a. C. M. 305 mm. Santarem, Dec. 20, 1909. Haseman. 



Haseman remarks of the last specimen " that it is jet black and 

 goes by the name 'Piranha negro/ " 



22. Serrasalmo paraense Steindachner. 

 Serrasalmo {Serrasalmo) paraense Steindachner, Anz. K. Acad. Wiss. Wien, 

 1908, p. 362 (Rio Para). 



Known only from the types. 



23. Serrasalmo humeralis Cuvier and Valenciennes. (Plate L.) 



Serrasalmo humeralis Cuvier & Valenciennes, Hist. Nat. Poiss., Vol. XXII, 

 1848, p. 279 (Amazon); Kner, Characinen, Vol. II, 1859, p. 30, taf. iv, fig. 9 

 (Rio Guapore, Barra do Rio Negro, Cujaba, Villa Maria, Rio Paraguay); 

 GiJNTHER, Cat. Fishes Brit. Mus., Vol. V, 1864, p. 370; Cope, Proc. Acad. Nat. 

 Sci. Phila., 1871, p. 292 (Ucayale); Steindachner, Flussf. Siidam., Vol. IV, 

 1882, p. 16 (Hualaga); Eigenmann & Eigenmann. Proc. U. S. Nat. Mus., 

 Vol. XIV, 1891, p. 60; Perugia, Ann. Mus. Civ. Stor. Nat. Genova, Ser. 2a, 

 Vol. X, 1891, p. 50 (Resistencia, Chaco Centrale); Boulenger, Trans. Zool. 

 Soc. London, Vol. XIV, 1896, p. 37 (Descalvados and Paraguay); Boll. Mus, 

 Univ. Torino, Vol. XV, 1900 (near Corumba); Fowler, Proc. Acad. Nat. Sci., 

 Phila., 1906, p. 469 (notes on Cope's specimens); Eigenmann, Ann. Carnegie 

 Mus., Vol. IV, 1907, p. 141 (Porto Murtinho, Bahia Negra); Reports Princeton 

 Univ. Exp. Patagonia, Vol. Ill, 1910, p. 442. 



Serrasalmo iridopsis Cope, Proc. Acad. Nat. Sci., Phila., 1871, p. 268, pi. ix, fig. 2 

 (Ambyiacu); Eigenmann & Eigenmann, Proc. U. S. Nat. Mus., Vol. XIV, 1891, 

 p. 60; Fowler, Proc. Acad. Nat. Sci. Phila., 1906, p. 471 (Ambyiacu, note on 

 the type, four and one-eighth inches long); Eigenmann, Reports Princeton 

 Univ. Exp. Patagonia, Vol. Ill, 1910, p. 442. 



Distribution. — Amazons and Paraguay. 



Cope in his description of iridopsis states that there are forty-one 

 abdominal serrse. Fowler in his reexamination found but thirty-one. 

 If there are but thirty-one serrae I can see no character by which this 

 species ditifers from humeralis. 



5786 a-c. C. M. 68 to about 144 mm. Rio Jauru, June, 1909, 

 p. 204. Haseman. 



5787 a-m. C. M. 25-126 mm. Villa Hays, April 11 and 13, 1909. 

 Haseman. 



5788 a~b. C. M. 58 and 77 mm. San Joaquin, Sept. 5, 1909. 

 Haseman. 



