410 EXPLORATIONS ACEOSS THE GREAT BASIN OF UTAH. 



The color is reddish-gi-ay or blue on the dorsal region, and on the abdomen is 

 whitish or whitish-yellow. The fins are uniform and colorless. 



Numerous specimens of this fish were obtained by Mr. McCarthy, the collector of 

 Captain Simpson's expedition, at Green River, Utah, and in the Platte Valley. 



Family SILUROID^, (Cuv.) Bleekek. 



SuBFAniiLY PIMELODIN^, (Bon.). 



Of this subfamily, there are found representatives of four genera and numerous 

 species in the fresh waters of the United States. These have hitherto, with the ex- 

 ception of the Notnri, been referred to one gentis, and for that genus the name of 

 Pimelodus has been retained. 



Now that the Plmdodi of Lacc^pfede have been distributed among numerous smaller 

 groiips or genera, it remains to ascertain to what group the name Pimelodus ought 

 to be restricted, and what names should be applied to the three genera now distin- 

 giiished among the American Piinelodma;, exclusive of the Noturi of Rafinesque. 



Lacepede characterized his genus PimeJodus simply by the presence of an adipose 

 fin, and included under the name the following species : 



PREMIER SOUS-GENRE. 



La nageoire de la queue fourchiie ou t^branchde en croissant : 



1. Le Pimelode bagre, Pimelodus hagrus zn Bagrus sp. Cuv. zz Galeiditliys Oro- 

 novii Val. = ^luricMhys hagrus B. & G. 



2. Le Pimelode chat, Pimelodus felis zz Siliirus felis Linn, partim. zz Anmirus 

 sp.* 



3. Le Pimelode scheilan, Pimelodus clarias Lac. zz Synod'ontis clarias Cuv. zz Sy- 

 nodontis arahi Val. zz Synodontis schal Bleeker. 



4 Le Pimelode bakre, Pimelodus fascintus zi Platystoma fasciatum Ag. zz Soru- 

 bium fasciatum Gill. 



5. Le Pimelode ascite, Pimelodus ascita = Embryonic young. 



6. Le Pimelode argente, Pimelodus argenteus. = Bagrus Herzbergie Val. zz Ne- 

 tuma Herzbergie Bleeker. 



7. Le Pimelode nceud, Pimelodus nodosus zz Arius nodosus Val. zz Auchenipterus 

 furcatus Val. =: Auchenipterus nodosus Mull. & Trosch., Bleeker. 



8. Le Pimelode quatre-taches, Pimelodus quadrimaculatus zz Hemipimelodus 

 quadrimaculatus Bleeker. 



9. Le Pimelode barbu, Pimelodus harhus zz Bagrus Commersonii Val. zz Guiritinga 

 Commersonii Bleeker. 



•The Pimelode chat (Pimelodus fells) of Lacepede is chiefly founded ou the Silurus felis of Linnjeus, and the enu- 

 meration of the rays of the dorsal and anal fins is taken from the Systema Naturw, but the mention of the color and 

 partly of the habitat appears to be on the authority of Daubeuton and Hauy and of Bonnaterre. 



The Silurus felis of Linnreus, described on the authority of Dr. G.ardon as having sis barbels and twenty-three 

 anal rays, and as being allied to the Silurus Catus, can only be an Amiurus, whose nasal barbels have been overlooked. 

 The species of the Encyclopedists described as being from Cayenne, where it is called Maclioiran blanc, Paisani, and 

 Petit Gueule, and whose color is white, is unrecognizable. 



