SOUTH AMERICAN NEMATOGNATHl. 139 



XXIII. SoRUBiMiCHTHYS Bleeker. 



82. Sorubimichthys planiceps (Agassiz.) 



Sorubim pirauaca Spix; Platystoma artedli Giinther; Sorubimichthys 



ortoni Gill. 

 Localities: Mauacapu ru ; Hyavary; Teflfe. 



83. Sorubimichthys spatula (Agassiz.) 



Sorubim jandia Spix. 



84. Sorubimichthys gigas (Gimtber.) 



XXIV. Platystomatichthys Bleeker. 



85. Platystomatichthys sturio (Kner.) 



Localities: Para; Curuca; Kio Muria. 



DOUBTFUL SPECIES. GenUS '? 



I. Bagrus flavicans Castelnau. II. Bagrus punctula- 

 tus id. 



XXV. Tachisurus Lac<^pede. 



Bagrus, Galeichthys, Arius Cuv. & Val. ; Arms Bleeker; 

 Sciades Miiller & Troschel; Sciades Bleeker 1863, not 1858; 

 Ariodes Miiller & Troschel; Hexanematichthys, Gephalocassis 

 Nefuma, Gidratinga, Sciadeidithys 1858, not 1863, Selenaspis, 

 Hemiarius, Pseudarius Bleeker; Leptarius, Notarius, Gill; 

 Cathorops Jordan & Gilbert. 



DOUBTFUL SPECIES. 



I. ^rms m"(/n'ca?is Valenciennes; II. Ai'ius obesas Scliom- 

 burgk. 



§ Galeichthys. 



86. Tachisurus lentiginosus sp. uov. 



Types, No. 4970, two specimens, each .39 m. long. Panama. Stein- 

 dachner. 



Body nearly terete anteriorly, becoming compressed 

 backward, the width above the pectorals a little greater than 

 the depth. Head flat, depressed, its depth at base of occi- 

 pital process le i^ it;s greatest width, which is about Ij in 

 its length. Occipital process somewhat roughened, about 



