754 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



examples. Without extensive series of materials it is often difficult 

 to use these characters except as basic specific divisions. 



A number of the species carry their eggs about in the mouth until 

 hatched. Others build nests in streams. 



ANALYSIS OF GENERA 



a\ Teeth present on palate. 



6\ Maxillary and mental barbels present Tachysurus 



6^ Only a pair of stiff osseous maxillary barbels present Osteogeneiosus 



or. No teeth on palate Hemipimelodus 



Genus TACHYSURUS Lacepede 



Tachysurus LAcfip^DE, Hist. Nat. Poiss., vol. 5, p. 150, 1803. (Type, Tachysurus 



sinensis Laci^pede, monotypic). 

 Galeichthys Valenciennes, Hist. Nat. Poiss., vol. 15, p. 28, 1840. (Type, Galcich- 



thys feliccps Valenciennes, designated by Bleeker, Nederland. Tijdschr. 



Dierk., vol. 1, p. 90, 1863). 

 Arius Valenciennes, Hist. Nat. Poiss., vol. 15, p. 53, 1840. (Type, Pimelodus 



arius Buchanan-Hamilton, tautotypic. ) 

 Sciades Mijlleb and Tboschel, Horae Ichth., pt. 3, p. 6, 1849. (Type, Bagrus 



(Sciades) pictus Miiller and Troschel.) 

 Ariodes MiJLUEB and Trosohel, Horae Ichth., pt. 3, p. 6, 1849. (Type, Bagrus 



(Arius) arcnarius Miiller and Troschel.) 

 Hexanematichthys Bleeker, Ichth. Arch. Ind. Prodr., vol. 1, Siluri, pp. 61, 126, 



1858. (Type, Bagrus sondalcus Bleeker, monotypic.) 

 Selenaspis Bleeker, Ichth. Arch. Ind. Prodr., vol. 1, Siluri, pp. 62, 66, 1858. 



(Type, Silurus herzhergii Bloch.) 

 Cephalocassis Bleeker, Ichth. Arch. Ind. Prodr., vol. 1, Siluri, pp. 62, 92, 1858. 



(Type, Arius melanochir Bleeker, designated by Bleeker, Atlas Ichth. Ind. 



Neerland., vol. 2, p. 7, 1862.) 

 Netuma Bleeker, Ichth. Arch. Ind. Prodr., vol. 1, Siluri, pp. 62, 93, 1858. (Type, 



Bagrus thalassinus Riippell.) 

 GuiriUnga Bleeker, Ichth. Arch. Ind. Prodr., vol. 1, Siluri, pp. 02, 67, 1858. 



(Type, Pimelodus commersonii Lacepede.) 

 Sciadeichthys Bleeker, Ichth. Arch. Ind. Prodr., vol. 1, Siluri, pp. 62, 66, 99, 1858. 



(Type Bagrus (Sciades) pictus Miiller and Troschel.) 

 Ariopsis Gill, Proc. Acad. Nat. Sci. Philadelphia (Fishes East Coast), p. 56, 



1861. (Type, Arius milbcrti Valeneieunes=;SfiZHr«s felis Linnaeus.) 

 Sarcogenys (Kuhl and Van Hasselt) Bleeker (not Gray, 1855, in birds), Atlas 



Ichth. Ind. Neerland., vol. 2, p. 28, 1862. (Type, Sarcogenys rostratus (Kuhl 



and Van Hasselt) 'Bleeker= Bagrus thalassinus Ruppell, monotypic.) 

 Catastoma (Kuhl and Van Hasselt) Bleeker, Atlas Ichth. Ind. Neerland., vol. 



2, p. 28, 1862. (Type, Catastoma nasutum (Kuhl and Van Hasselt) 



BLEEK^u=Bagrus thalassinus Ruppell, monotypic.) {Catostoma Wagler, 



1830, in reptiles not involved.) 

 Hemiarius Bleeker, Ned. Tijdschr. Dierk., vol. 1, p. 90, 1803. (Type, Cephalo- 

 cassis stormi Bleeker.) 

 Leptarius Gill, Proc, Acad. Nat. Sci. Philadelphia, 1863, p. 170. (Type, Lep- 



tarius doivii Gill, monotypic.) 



