116 FISHES OF WESTERN SOUTH AMERICA 
Fie. 17. The Rio Ucayali; a fuel-stop. 
Type: Pinirampus agassizi Steindachner 
Rio Magdalena to La Plata 
Nares remote; gill-membranes free from isthmus; spines of dorsal and pectoral 
fins weak and lacking pungency, remaining rays graduated backward; mouth 
slightly inferior, jaws subequal; palatines edentulous; head small, but much longer 
than broad; eye large and in middle of head; jaw teeth strong, without backward- 
directed angle; mental barbels two pairs; occipital fontanel wanting or reduced to 
a pore; occipital process narrow, reaching about half way to the dorsal, where it 
meets a floating interneural attached to the interneural which supports the first 
dorsal ray. 
The generic distinctness of agassizi was recognized by the Kigenmanns in the 
1890 monograph, where it was listed under an unnamed genus in the absence of 
specimens, to be rescued ten years later by Eigenmann and Norris, reduced to 
synonymy in 1910, and again revived by Driver nine years later and placed in a 
distinct subfamily with Luciopimelodus. 
