406 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Var. eoenosus. 

 1836 — Silurus (Pimelodus) ccenosus Eich. Fauna, Bor.-Amer. Fislies, p. 132. 



Silurus {Pimelodus) ccenosus Cuv. & Val. (1840), xv, 29. 



Silurus {Pimelodus) ccenosus DeKay (1842), Fishes N. Y. 186. 



Silurus {Pimelodus) ccenosus Storer (1846), Synopsis, 402. 



Amiurus ccenosus Gill (1862), Proc. Bost. Soc. Nat. Hist. 44. 



Amiurus ccenosus Cope (1870), Proc. Am. Pliilos. Soc. 485. , 



Amiurus ccenosus Jordan (1876), Man. Vert. 303. 



Amiurus ccenosns Jordan & Copeland (1876), Check List, W9. 

 Var. antoniensis. 

 1859 — Pimelodus antoniensis Grd. Pac. E. E. Expl. x, 291. 



Amiurus antoniensis Gill (1862), Proc. Bost. Soc. Nat. Hist. 44. 



Amiu7'us antoniensis Cope (1870), Proc. Am. Philos. Soc. 485. 



Var. analis. 

 1877— Amiurus natalis subspecies analis Jordan (1877), Bull. U. S. Nat. Mus. x, 87. 



Several young specimens of the Southwestern variety (antoniensis) 

 of this most widely diffused species. The differences separating this 

 form from the variety cupreus are very slight. 



