38 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY 1. 



•5th subgenus, DEC ACT YLUS. (p. CO.) 



66th species, Pittsburgh Sucker, CATOSTOMUS DUQUESNI, Catostome 

 duquesne. (p. 60.) 



Myxostoma duquesnii (Le S.) Jor. 



67th species, Long Sucker, CATOSTOMUS ELONGATUS, Catostome 

 alonge. (p. GO.) 



CyCLI.PTUS ELONGATUS (Le S.) Ag. 



XXL Genus, SUCKREL, CYCLEPTUS, Cyclepte. (p. CI.) 



68th species. Black Suckrel, CYCLEPTU3 NIGRESCENS, Cyclepte 

 noiratre. (p. 61.) 



CYCLEPTUS ELONGATUS (Le S.) Ag. 



A very poor description, "on the authority of Mr. Bollman, of Pitts- 

 burgh". 



tXXII. Genus, CATFISH, PIMELODUS, Pimelode. (p. 61.) 



Subgenus, ICTALURUS. (p. 61.) 



1st section, ELLIQPS. (p. 62.) 



Tail forked. Eyes elliptical. Abdominal fins with less than nine 

 rays. 



69th species. Spotted Catfish, PUVTELODUS MACULATUS, Pimelode 

 tachete. (p. 62.) 



ICHTH^^LURUS PUNCTATUS (Raf.) JoF. 



Silurus punctatus Eaf., 1818. 



70th species. Blue Catfish, PIMELODUS CBRULE SCENTS, Pimelode 

 bleuatre. (p. 63.) 



ICHTHiELURUS PUNCTATUS (Raf.) Joi*. 



• Body nearly cylindrical, abdominal fins with 10 rays ; tail equally forked. 



Besides the two following species, the C. bostoniensis and C. hadsonins must be enu- 

 merated here. 



IBody ecaleless, elongated. Head large, with barbs. Two dorsal fins, the second 

 Hrdipose and separated from the tail, the first short and commonly armed. Pectoral fins 

 commonly armed. Teeth like a file. Vent commonly posterior. 



The extensive genus Silurus of Linnaeus, which is scattered throughout the riv^ers of 

 both continents, has not yet been completely illustrated, notwithstanding the labors of 

 the modern ichthyologists. I have found in the Ohio about twelve species belonging 

 to it, most of which oftor cousimilar character, and appear to belong to the genus Pi- 

 melodus of Lacdpt^de and Cuvier, which have left the name of Silurus to the species 

 having one dorsal fin. I bave alreadj^ published a monography of thiin in the Journal 

 of the Royal Institution of Loudon, under the generic name of Silurus. I now pro- 

 pose to form with them a peculiar subgenus, divided in many sections, and different 

 from the subgenera Bagrus, Synodontus, Silusox, &c. 



