228 PROCEEDINGS OF THE NATIONAL MUSE.UM vol.94 



wide bands on the dentaiy and premaxillary; eye with free margin, 

 and nostrils widely separated nearer front of snout than eye; inner 

 edge of operculum with one or two folds or "pouches"; gill rakers stiff. 

 The similarity in the above-mentioned characters has influenced me to 

 separate them as a subfamily, although its limits are ill defined, and 

 doubt must be cast on such grouping. 



Only those genera and species so far found in Venezuela are listed 

 below, but other genera were included in the key on pages 187-189 in 

 order to indicate relationships among the various genera and to record 

 those genera that may belong to the Sorubiminae. 



Genus HEMISORUBIM Bleeker 



Ilemisorubim Bleeker, Nedcrl. Tijdschr. Dierk., vol. 1, p. 97, 1863. (Type, 

 Platystoma platyrhynchos Cuvier and Valenciennes.) 



HEMISORUBIM PLATYRHYNCHOS (Cuvier and Valenciennes) 



Dormil6n 



Platystoma ■platyrhynchos Cuvier and Valenciennes, Histoire naturclle des 



poissons, vol. 15, p. 27, 1840. 

 Hemisoruhim platyrhijnchtis Peters, Monatsb. Akad. Wiss. Berlin, 1877, p. 470 



(Calabozo, Venezuela). 



Genus SORUBIM Agassiz 



Sonihim Agassiz, in Spix, Sclecta genera et species piscium . , . Brasiliam 

 . . . , p. 24, 1829. (Type, Silurus lima Bloch.) 



SORUBIM LIMA (Bloch) 



Paleta 



Figure 3, h 



Sihirus lima Bloch, iti Schneider, Sj'stema ichthyologiae, p. 384, 1801. 



Soruhim lima Peters, Monatsb. Akad. Wiss. Berlin, 1877, p. 469 (Calabozo, 



Venezuela). — Pellegrin, Bull. Mus. Hist. Nat. Paris, vol. 5, p. 158, 1899 



(Apure River, Venezuela). 



Genus SORUBIMICHTHYS Bleeker 



Sorubimichthys Bleeker, Nederl. Tijdschr. Dierk., vol. 1, p. 98, 1863. (Type, 

 Platystoma spatula Agassiz.) 



SORUBIMICHTHYS PLANICEPS (Agassiz) 



Platystoma planiceps Agassiz, in Spix, Selecta genera et species piscium . . , 

 Brasiliam . . ., p. 25, 1829 (ref. copied). — Peters, Monatsb. Akad. Wiss. 

 Berlin, 1877, p. 469 (Calabozo, Venezuela).- — Ernst, Estudios sobre la flora 

 y fauna de Venezuela, p. 282, 1877 (creeks near Caracas). 



Sonibimichthys planiceps Eigenmann and Allen, Fishes of western South 

 America, p. 115, 1942 (Amazon and Orinoco). 



