29. SILURID^ ICTALURUS. 107 
{i-/Ju 7 , fisli; at?.oupoq, cat} lience more correctly, tlioiigh less euphonious- 
ly, Ichthcchirus.) 
a. Bony bridge from occiput to dorsal not quite continuous. 
b. Anal tin moderate, of 20-22 rays. 
102. I. lopliaiis (Cope) J. &G. 
Pale olive-bluish, silvery below. Body rather stout. Head very 
broad, about as wide as long, its width 3£ iu 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 lophius Cope, Proc. Amer. Phil. Soc. 1S70, 486 : Amiurus lopliius Jordan, 
1. c. 85.) 
103. I. a.l1t>idus (Le Sueur) J. & 6. — 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 tlian half the length of the spine, extremely 
rugose. Anal rays 21 ; base of anal 4^-5 iu length. Dorsal fin nearly 
midway between adipose fin and snout. L. 18 inches. Pennsylvania 
to North Carolina. 
{Pimclodns albidns Le Sueirr, Mdm. Mus. v, 148, 1819 : Pimelodus lynx Girard, Proc. 
Acad. Nat. Sci. Phila. 18.59, 160: Amiurus albidus Jordan, 1. c. 84.) 
bb. 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| iu 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. Sujiraoccipital bone almost meeting the iuterspinal ; its 
relations therefore very close to Ictalurus punctatus. Streams of Texas. 
{Pimelodus lupus Grd. U. S. Pac. R. E. Expl. x, 211 : Amiurus lupus Jordan, 1. c. 83 : 
Amiurus lupus Gunther, v, 101.) 
105. I. niveiventris (Cope) J. & G. 
Similar to I. lupus, but the head broader, its width equal to its length 
above. Dorsal spine scarcely nearer snout than adiiiose fin. Anal 
24, shorter than head. Barbel longer than head j humeral process very 
rugose. Neuse Eiver, North Carolina. 
{Amiurus niveiventris Cope, Proc. Amer. Phil. Soc. 1870, 486: Amiurus niveiventris Jor- 
dan, 1. c. 83.) 
