30 CALIFORNIA ACADEMY OF SCIENCES. 



Paradiplomystax Giinther, Cat. Fishes Brit. Mus. v, 

 180, 1864 (corusccms). 



Maxillary barbels only, flat. Occipital process keeled, 

 narrowed posteriorly and joined to the dorsal plate. 



17. Paradiplomystes coruscans. 



Pimelodes coruscam Lichteustein, Wiedem. Zool. Mag. i, part 3, 58 



(Brazil). 

 Paradiplomystes corttscans Bleeker, Nederl.'Tijdsclir. Dierkuude, i, 



186.3, 92 (name only). 

 Paradiplomystax coruscans Giinther, Cat. Fish. Brit. Mtis. v, ISO, 



1864 (copied). 



Barbels reaching to the middle of the body. Caudal 

 forked; adipose oval. Upper lip projecting, jaws and 

 palate with villiform teeth; eyes over the angle of the 

 mouth. Br. 7; D..8; A. 13. (Lichtenstein.) 



This species is known from a single specimen .075 m. 

 long in the Museum of the Berlin University; its exact 

 locality is not known. 



VII. AlLURICHTHYS, 



Ailurichthys Baird and Girard, Proc. Acad. Nat. Sci. 

 Phila. 1854, 26 {marinus). 



Murichilujs Gill, Proc. Acad. Nat. Sci. Phila. 1863, 

 172. 



Pimelodus Bleeker, Silures de Suriname 65, 1864 

 (bagre). 



Type: Silurus r)iarinus Mitchil. 



Barbels four, maxillary barbels broad, band-like. 

 Pectoral spines, and usually the dorsal spine, with a 

 long band-like filament. Anal fin emarginate; caudal 

 fin deeply forked. Vomer and palatine teeth forming 

 a more or less crescentiform band. 



This genus is composed of four species, two of which 

 are found on the west coast of Panama and two on the 

 east coast of tropical America. 



