242 Annals of the Carnegie Museum. 



Distribution. — Upper courses of all streams of Guiana. 



In spite of the many references, the only authentic specimen of this 

 species is the type in the Berlin Museum, which I examined, and which 

 has forty abdominal serrae. 



Dr. J. D. Anisits has kindly reexamined the type, Xo. 3631 Berlin 

 Museum, and has given me the following data. Total length 365 

 mm., body 335, height 180. Head 3 in the total length; eye 5 in 

 the head, 3 in the interorbital; abdominal serrae 40-41; D. 17, A. 34; 

 scales about 40-130-42. I owe to Director Dr. A. Brauer the photo- 

 graph of the type, which is reproduced in Plate XLV. 



6. Rooseveltiella nattered (Kner). 



Serrasalmo natlereri Kner, Characinen, Vol. II, 1859, p. 28, taf. 3, fig. 8 (Matto 

 Grosso; Cuyaba); Gunther, Cat. Fishes Brit. Mus., Vol. V, 1864, p. 369; 

 Cope, Proc. Acad. Nat. Sci., Phila., 1871, p. 292 (between Rio Negro and 

 Ucayale); Peters, Mb. Ak. Wiss. Berlin, 1877, p. 472 (San Fernando de Apure); 

 Pellegrin, Bull. Mus. d'Hist. Nat., 1899, p. 406 (Manaos); Boulenger, 

 Boll. Mus. Univ., Torino, Vol. XV, 1900 (near Corumba); Fowler, Proc. 

 Acad. Nat. Sci. Phila., 1906, p. 468 (Peruvian Amazon). 



Serrasalmo {Pygocentriis) natlereri Steind.\chner, Flussfisch. Siidani., Vol. Ill, 

 1 88 1, p. 12 (La Plata). 



Pygocenlrus nallereri Eigenmann & Eigenmann, Proc. U. S. Nat. Mus., Vol. XIV, 

 1891, p. 60; Berg, An. Mus. Nat. -Buenos Aires, Vol. V, 1897, p. 283 (San 

 Pedro on Rio Parana; Martin Garcia; Boca de Riachuela on Rio de la Plata); 

 Eigenmann & Ogle, Proc. U. S. Nat. Mus., Vol. XXXIII, 1907, p. 35 (Para- 

 guay; Brazil); Eigenmann, Ann. Carnegie Mus., Vol. IV, 1907, p. 141 (Porto 

 Murtinho; Corumba); Eigenmann, Reports Princeton Univ. Exp. Patagonia, 

 Vol. Ill, 1910, p. 442. 



Distribution. — La Plata and Amazon basins; POrinoco. 



6528 a-b. C. M. 1 18-126 mm. San Joaquin, Bolivia, Sept. 4, 1909. 

 Haseman. 



6529 a. C. M. 173 mm. about. Santarem, Dec. 6, 1909. Hase- 

 man. 



6526 a-b. C. M. 149 mm. to end of lateral line. \'il!a Hays, 

 xA.pril 13, 1909. Haseman. 



6533 C. M. 1. 15 mm. Rio Jauru, June 4, 1909. Haseman. 



6527 a. About 24 mm. Corumba, April 28, 1909. Haseman. 



D. 17-19; A. 28-31; serrae 24-28; interorbital 2-2.1 in the head; 

 depth 1.87-2; anal shorter than head, even in small, equal to head 

 without opercle in large individuals; origin of dorsal equidistant from 

 anterior margin of orbit and end of lateral line. Base of dorsal 



