29. SILURID^G ICTALURUS. 107 



u-, fish; atAoupos, cat; hence more correctly, though less euphonious- 

 ly, Iclithcclurus.) 



&,. Bony bridge from occiput to dorsal not quite continuous. 

 b. Anal tin moderate, of 20-22 rays. 



102. I. lopliiiis (Cope) J. &G. 



Pale olive-bluish, silvery below. Body rather stout. Head very 

 broad, about as wide as long, its width 3% in length of the body. Eye 5-6 

 in iuterorbital width. Caudal not deeply forked. Upper jaw not much 

 the longer. Mouth wider than in any other cat-fish. Humeral pro- 

 cess stout, shortish, somewhat rugose. Anal rays 21 ; base of anal 6 in 

 length. L. 24 inches. Streams about Chesapeake Bay. 



(Amiurus lopliius Cope, Proc. Arner. Phil. Soc. 1870, 48(3 : Amiurus lopMus Jordan, 

 1. c. 85.) 



103. I. albidus (Le Sueur) J. & G. White-Cat; Channel Cat of the Potomac. 

 Pale olive-bluish, silvery below. Body moderately stout. Head longer 



than wide, its width 4-6 times in length. Mouth rather narrow. Upper 

 jaw much the longer. Eye 3-5 in interorbital width. Barbels long, 

 except nasal barbel. Caudal fin deeply forked, the upper lobe the longer. 

 Humeral process more than half the length of the spine, extremely 

 rugose. Anal rays 21 ; base of anal 4-5 in length. Dorsal fin nearly 

 midway between adipose fin and snout. L. 18 inches. Pennsylvania 

 to North Carolina. 



(Pimelodus albidus Le Sueur, Me'm. Mus. v, 148, 1819 : Pimelodus lynx Girard, Proc. 

 Acad. Nat. Sci. Phila. 1859, 160: Amiurus albidus Jordan, 1. c. 84.) 



Ib. Anal fin long, of 23-27 rays. 



104. I. lupus (Grd.) J. & G. 



Dusky olivaceous, sides silvery. Body rather slender. Head narrow, 







longer than broad, its width 4| in length, being less than its length 

 above. Dorsal spine much nearer snout than adipose fin. Base of anal 

 as long as head. Anal 23. Pectoral spines long and slender, dentate. 

 Barbels long. Supraoccipital bone almost meeting the interspinal ; its 

 relations therefore very close to Ictalurus punctatus. Streams of Texas. 



(Pimelodus lupus Grd. U. S. Pac. R. R. Expl. x, 211 : Amiurus lupus Jordan, 1. c. 83 : 

 Amiurus lupus Giiuther, v, 101.) 



105. I. niveiveutris (Cope) J. & G. 



Similar to I. lupus, but the head broader, its width equal to its length 

 above. Dorsal spine scarcely nearer snout than adipose fin. Anal 

 24, shorter than head. Barbel longer than head 5 humeral process very 

 rugose. Keuse River, North Carolina, 



(Amiurus niveivcntris Cope, Proc. Amer. Phil. Soc. 1870, 486 : Amiurus niveiventris Jor- 

 dan, 1. c. 83.) 



