44 



D. 1-51 ; A. 24; P. 1-9; V. 1-7. 



The color of the shrunk alcoholic specimens is purplish brown 

 above, and silvery bronze on the sides. The free half of the anal 

 fin is darker. 



This species is very nearly allied to Ictalurus coerulescens (Pime- 

 lodus coerulescens E,af. not Lac), Ictalurus affinis (Pimelodus affinis 

 Girard), Ictalurus olicaceus (Pimelodus olivaceus Girard), and Ictalu- 

 rus vulpes (Pimelodus vulpes Girard). From the first two it is dis- 

 tinguished by the fewer rays of the anal fin, and apparently from the 

 latter by the length of the head and of the barbels. 



Two specimens were obtained by Dr. Suckley in the " Big Sandy 

 River " of Kansas. 



Genus Amiurus (Raf.) Gill. 



The genus Amiurm contains all the cat-fishes with wide and de- 

 pressed heads covered with a thick skin, and has as its type the 

 Pimelodus catus of most authors. The following species belong to 

 this genus : — 



Amiurus catus r^Silurus catus Zmn. = Pimelodus catus auct. 



Amiurus cupreus=Silurus cupreus jRa/.z= Pimelodus cupreus i^a/ 

 Kirtland. 



Amiurus xanthocephalus — Silurus xanthocephalus itfl/=: Pime- 

 lodus xanthocephalus (Raf.) Kirtland. 



Amiurus albidus = Pimelodus albidus Les. 



Amiurus nebulosusi= Pimelodus nebulosus Les. 



Amiurus nigricans = Pimelodus nigricans Zci'izz Pimelodus nigrescens 

 Richardson. 



Amiurus natalis=: Pimelodus natalis Les. 



Amiurus coenosusz= Pimelodus ccEnosus Richardson. 



Amiurus borealis = Pimelodus borealis Rich. 



Amiurus puUus^ Pimelodus pullus Dekay. 



Amiurus atrarias=: Pimelodus atrarius Dekay. 



Amiurus felis:= Pimelodus felis Agassiz (not Lac.) 



Amiurus catulus=: Pimelodus catulus Girard. 



Amiurus felinus zz:: Pimelodus felinus Girard. 



Amiurus antoniensis=Pimelodus antoniensis Girard. 



Amiurus ailurus=Pimelodus ailurus Girard. 



Amiurus Hoyi=PImelodus Hoyi Girard. 



Amiurus confinis^ Pimelodus confinis Girard. 



Amiurus cupreoides=Pimelodus cupreoides Girard. 



Amiurus Dekayi=Pimelodus Dekayi Girard. 



Amiurus lynx=Pimelodus lynx Girard. 



Amiurus jHnna=Pimelodus puma Girard. 



Amiurus vulpeculus=Pimclodus vulpeculus Girard. 



Amiurus platycephalus=Pimelodu? platycephalus Girard. 



