250 



Annals of the Carnegie Museum. 



ggg. Anal rounded in front, or the third ray, which is but little heavier 

 than the following one, slightly prolonged, milk-white; second 

 suborbital convex below; ventral serrae much more feeble 

 than in humeralis, 30-35. most frequently 34; depth 1.8; 

 D. usually 16 or 17; A. 33-37, most frequently 35. 



hrandli Reinhardt. 25. 

 ccc. Margin of caudal light, no submarginal black band. 



h. Margin of anal light; snout blunt, six tenths as long as eye, or equal 

 to the eye; a considerable naked area on the cheek; D. 15 or 16, 



A. 32-37; serrae 22-33 (See Pristobrycon aureus Agassiz.) 



hh. Margin of anal dark in the adult; snout pointed, longer than snout 

 of aureus, young slenderer than young of aureus. 



7narginatus Valenciennes. 26. 



15. Serrasalmo elongatus Kner. 



Fig. 4. Dentition of Serrasalmo elongatus Kner. (Enlarged.) 



Serrasalmo elongatus Kner, Characinen, Vol .II, 1859, p. 36, taf. v, fig. 12 (Rio 

 Guapore, Matto Grosso); Gunther, Cat. Fishes Brit. Mus., Vol. V, 1864, p. 371; 

 Steindachner, Flussf. Siidam., Vol. IV, 1882, p. 16 (Huallaga); Eigenmann 

 & Eigenmann, Proc. U. S. Nat. Mus., Vol. XVI, 1891, p. 60; Eigenmann, 

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



Distribution. — Rios Guapore and Amazon. 

 5757 C'~'^- C. M. Three, 164 to about 200 mm. Santarem, Dec. 8, 

 1909. Haseman. 



