198 MEMOIRS OF THE CARNEGIE MUSEUM 



Trachycorystes Bleeker. 



Trachycorystes Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 88 (typus = trachy- 

 corystes) . 



Parauchenipterus Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 88 (galeatus). 

 Type, Trachycorystes typus Bleeker. 

 Mental barbels in two pairs; adipose fin shorter than the anal fin; anal 19-41; 



caudal obliquely truncate or slightly emarginate; outer margin of pectoral spine 



serrate. 



Key to the Species of Trachycorystes. 

 a. Caudal oblique. 



6. Dorsal spine longer than the pectoral spine, which is 1.5 in the head; head covered with smooth 



skin glaber. 



bb. Pectoral spine longer than dorsal spine, about as long as head; head granular, or covered with 



thin skin in the young; A. 22-28 galeatus. 



aa. Caudal emarginate; A. 19 or 20; dorsal spine serrate on its anterior edge; pectoral spine as long as 

 the head obscurus. 



68. Trachycorystes glaber (Steindachner). 



Auchenipterus glaber Steindachner, " Susswasserfische Sudostlichen Brasilien," iii, 



1876, 97, footnote (Demerara). 

 Trachycorystes glaber Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), I, 



1888, 154 (name only); Occasional Papers Cal. Acad. Sci., I, 1890, 272, 275- 



Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 395. 



No specimens of this species were obtained. It is known from the types in 

 the Vienna Museum. 



D. 1,5; A. 23; dorsal spine smooth on outer, weakly serrate on inner margin, 

 longer than pectoral spine, 1.25 in the head; pectoral spine 1.5 in the head; caudal 

 obliquely rounded. 



69. Trachycorystes galeatus (Linnaeus). 



Silurus galeatus Linnaeus, Syst. Nat., ed. 12, I, 1766, 503 (based on Seba, Locupl. 



Rer. Nat. Thes. Ace. Descr., Ill, 1748, pi. 29, fig. 7).— Gmelin, Syst. Nat., 



I, iii, 1788, 1357.— Bloch, Ausl. Fische, VIII, 1794, 39, pi. 369, fig. 1- 



Bloch and Schneider, Syst. Ichth., 1801, 384. 

 Pimelodus galeatus Lacepede, Hist. Nat. Poiss., V, 1803, 97, 114 (South America). 

 Auchenipterus galeatus Gunther, Catalogue, V, 1864, 196 (Guiana). — Peters, 



MB. Akad. Wiss. Berlin, 1877, 470 (Calabozo). 

 Parauchenipterus galeatus Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 88 (name 



only); " Silures de Suriname," 1864, 45 (Surinam). 



