254 



Annals of the Carnegie Museum. 



Pygocentrus melanurus Heckel, Ms. in Kner, 1. c. 

 Pygocenlrus nigricans Heckel Ms. in Kner, 1. c. 



Serrasalmo brandli Ulrey (not Liitken), Ann. N. Y. Acad. Sci., Vol. VII, 1895, p. 

 298 (Brazil). 



Fig. 6. Dentition of Serrasalmo macidatus Kner. The upper cut represent, 

 the palatines of a specimen 177 mm. long, the others are from a specimen 147 mm. 

 long. (Greatly enlarged.) 



Distribution. — Amazons to Bolivia. 

 57900-^. C. M. 120-188 mm. Manaos, Dec. 9 and 11, 1909. 



Haseman. 



Depth 1. 74-1. 8; D. 16 or 17; A. 31-34; serrae 32-34; interorbital 

 2.52-2.66 in the head. Origin of dorsal nearer tip of snout than end 

 of lateral line in the two smaller specimens equidistant from anterior 

 nares and end of lateral line in the largest; distance between dorsal 

 and base of upper caudal fulcra longer than the base of the dorsal, 

 equal to the head or the part of the head behind the anterior nares; 

 base of anal longer than head. Caudal bordered with dark. 



21. Serrasalmo rhombeus (Linnaeus). (Plate LVIII.)* 

 Salmo rhombeus Linn.eus, Syst. Nat. ed. XII, Vol. I, 1766, p. 514 (Surinam); 

 Pallas, Spicil. Zool., Vol. VIII, 1769, p. 57, tab. s, fig. 3: Gmelin, Syst. Nat., 

 Vol. I, 1788, p. 686, no. 28; Block, Ausl. Fische, p. 112, 1794, taf. 383; Block 

 & ScKNEiDER, Syst. Ichth., 1 80 1, p. 404. 



^The negative of Plate LVIII was made by Dr. Raymond C. Beeler in the 

 Laboratory of Dr. Albert M. Cole, both of the gentlemen being residents of 

 Indianapolis. I am greatly indebted to them for their kindness. The Author. 



