Eigenmann: The Serrasalmin.b and Mylin.^i:. 243 



equal to head without mouth or without snout and half eye. Distance 



between dorsal and upper caudal fulcra equal to, or a little shorter 



than, the postorbital portion of the head, shorter than the base of 



the dorsal or rarely equal to it; ventral spines with broad transverse 



basis. 



7. Rooseveltiella notatus (Liitken). 



Fig. 2. Premaxillary and mandibular teeth of Rooseveltiella nolaliis (Liitken). 



Serrasalmo {Pygocenlrus) notatus Lutken, Vid. Med. Nat. For. Kjob., 1874, p. 238 



(Venezuela). 

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



1891, p. 60; Eigenmann, Reports Princeton Univ. Exp. Patagonia, Vol. Ill, 



1910, p. 442. 

 Pygocenlrus piraya {non Cuvier) Eigenmann, Mem. Carnegie Mus., Vol. V, 1912, 



p. 384 (Twoca Pan). 



Distribution. — Orinoco, Essequibo, and Amazon basins. 



6530 a. C. M. About 215 mm. over all. Manaos, Nov. 17, 1909. 

 Haseman. 



6531 a. C. M. About 230 mm. Lagoa de Paranagua, Jan. 16, 1908. 

 Haseman. 



?5695 a-b. C. M. 20-46 mm. Lagoa de Paranagua, Jan. 17, 1908. 

 Haseman. 



6532 a-c. C. M. About 125-145 mm. Santarem, Dec, 1909. Hase- 

 man. 



These specimens may represent Pygocentncs notatus Lutken. 



Lutken states that the origins of the dorsal and ventral fins are 

 equidistant from the snout. In all of the specimens enumerated 

 above the distance between the ventrals and the snout is less by at 

 least an orbital diameter than the distance from the snout to the 

 dorsal. In other respects they are like notatus as far as Liitken's 

 description goes. 



