[emoirs Carnegie Museum, Vol. V. 



Plate LVI. 



1. Serrasalmo rhombeus (Linnaeus). 56mm. No. 1741. 2. Pygocentrus bilineatus Eigenmann. (Co- 

 type.) 56 mm. I. U. No. 11,757. 3. Catoprion mento (Ctjvier). 79 mm. No. 1740. 



