100 silurid;e. 



2. Amiurus cantonensis. 

 Pimelodus cantonensis, Cuv. ty Val. xv. p. 142. 

 D. 1/6. A. 19. 



This species appears to be extremely similar to A. catus ; having 

 only one example, which is rather deformed by stuffing, we are not 

 able to point out its distinctive characters. It seems to be more 

 elongate, the height of the body being contained five times and a 

 third in the total length (without caudal) ; its ventral is inserted at 

 some distance behind the dorsal. However, these characters may 

 not be found in well-preserved specimens. 



China. 



a. Adult. Presented by J. It. Eeeves, Esq. 



3. Amiurus nigricans. 



Pimelodus nigricans, Lesueur, Mem. Mus. d'Hist. Nat. 1819, v. p. 153. 



pi. 16. fig. 3 ; Cuv. fy Val. xv. p. 133 ; Dekay, New York Fauna,Fishes, 



p. 180. pi. 52. fig. 170 ; Hyrtl, Denkschr. Acad. Wiss. Wien, 1859, xvi. 



p. 16. 

 ? Pimelodus ccenosus, Richards. Faun. Bor.-Amer. Fish. p. 132; Cur. 



8f Val. xv. p. 129. 

 Pimelodus nigrescens, Richards. 1. c. p. 134. 

 felinus, Girard, in U. S. Pacif. R. R. Expl. Fish. p. 209. 



B. 8. D. 1/6. A. 25. P. 1/9. Vert. 16/30 {Hyrtl). 



Head one-fourth longer than broad ; the maxillary barbels extend 

 to, or somewhat beyond, the end of the head. Dorsal and pectoral 

 spines short, less than one-half of the length of the head ; pectoral 

 spine stoutish, denticulated interiorly. Adipose fin short ; caudal 

 truncated. 



Northern lakes of America. 



a. Fine specimen. 



4. Amiurus borealis. 



The Mathemeg or Land-cod. 



Pimelodus borealis, Richards. Faun. Bor.-Amer. Fish. p. 135. 



D. 1/6. A. 25. 



Head as broad as long ; the maxillary barbels extend to the gill- 

 opening ; pectoral spine not denticulated ; caudal fin slightly emar- 

 ginate. (Richards.)* 



Pine Island Lake. 



5. Amiurus ailurus. 



Pimelodus ailurus, Girard, in U. S. Pacif. R. R. Exped. Fish. p. 210. 

 pi. 44. 



D. 1/6. A. 22. P. 1/8. 



The lower jaw is the longer. The maxillary barbels extend some- 

 what beyond the gill-opening ; dorsal and pectoral spines serrated ; 

 caudal somewhat emarginate. {Girard.) 



Minnesota. 



