38 CONTRIBUTIONS TO NOETH AMERICAN ICHTHYOLOGY 1. 



•5th subgenus, DECACTYLUS. (p. 60.) 



CStli species, Pittsburgh Sucker, CATOSTOMUS DUQUESNI, Catostome 

 duquesne. (p. 60.) 



Myxostoma duquesnii (Le S.) Jor. 



67th species, Long Sucker, CATOSTOMUS BLONGATUS, Catostome 

 alonge. (p. 60.) 



Cyclkptus elongatus (Le S.) Ag. 



XXI. Genus, SUCKRBL, CYCLEPTUS, Cyclepte. (p. 61.) 



68th species. Black Suckrel, CYCLEPTUS NIGRESCBN3, Cyclepte 

 noiratre. (p. 61.) 



CYCLEPTUS ELONGATUS (Le S.) Ag. 



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

 burgh". 



t XXII. Genus, CATFISH, PIMELODUS, Pimelode. (p. 61.) 



Subgenus, ICTALURUS. (p. 61.) 



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



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

 rays. 



69th species, Spotted Catfish, PIMELODUS MACULATUS, Pimelode 

 tachete. (p. 62.) 



ICHTH^LURUS PUNCTATUS (Eaf.) Jor. 



Silurus punctatus 'Raf., 1818. 



70th species, Blue Catfish, PIMELODUS CBRULB.3CEN3, Pimelode 

 bleuatre. (p. 63.) 



ICHTH^LURUS PUNCTATUS (Raf.) JoF. 



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



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

 merated here. 



tBody scaleless, elongated. Head large, with barbs. Two dorsal fins, the second 

 adipose 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 Siliims of Linnajus, which is scattered throughout the rivers 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 offer consimilar character, and api)ear to belong to the genus Pi- 

 melodus of Lac6pMe and Cnvier, which have left the name of Silurus to the species 

 having one dorsal fin. I have already published a monography of them in the Journal, 

 of the Eoyal Institution of London, 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, Synoilontus, Silusox, &c. 



