786 FISHES—SILURIDA. 
Diagnosis.-This is the only Cat-fish in Ohio having more than thirty 
rays in the anal fin. 
Habits —I have seen one or two specimens taken at Chinen N oth- 
ing distinctive is known of its habits, which are probably identical 
with those of its cogener, J. punctatus. 
13. IcHTHALURUS ROBUSTUS Jordan. 
Chuckle-headed Cat. 
Ichthelurus robustus, JORDAN (1876), Bull. U. S. Nat. Mus., x, 76; Man. Vert., Ed. 2d, 
1878, 328. 
Description.—Body rather stout and deep, compressed behind ; the back elevated ; head 
rather large, one-third longer than broad; the eye moderate, wholly in front of the mid- 
dle of the head; slope from snout to base of dorsal more or less concave, the dorsal re- 
gion being elevated; skin thick; coloration pale, little silvery; anal fin moderate, its 
base 34 to 4 in length; its rays 27 to 30; head 44 in length; depth about 4; pectoral 
spine little more than half the length of head; length 1 to 2 feet. 
- Habitat, Ohio Valley, Mississippi Valley, not very common. 
Diagnosis.—F rom I. punctatus this species may be known by the smaller 
and more anterior eye, which is in front of the middle of the head; 
from I. furcatus it is separated by the shorter anal fin. 
Habits.—The few specimens known of this species are from the lower 
Ohio, Illinois, and Mississippi Rivers. Nothing distinctive is known of 
its habits in life. 
14. IcHTHALURUS PUNCTATUS Jordan. 
Blue Cat; White Cat; Silwer Cat; Chammel Cat. 
Silurus punctatus, RAFINESQUE (1818), Amer. Monthly Mag. and Critical Review, Sep- 
tember, 359. 
Ictalurus punctatus, JORDAN (1876), Bull. Buff. Soc. Nat. Hist., 95; ‘Manual of Ver- 
tebrates, 300.—JORDAN and COPELAND (1876), Check List, Bull. Buff. Soc. Nat. 
Hist., 159.—JoRDAN (1877), Annals Lyc. Nat. Hist. N. Y., —. —NELSON (1876), eal 
Ils. Mus. Nat. Hist., 50. 
Ichthelurus punctatus, JORDAN (1878), Bull.U. 8S, Nat. Mus., x, 76; Man. Vert., Ed. 
2d, 328. 
Pimelodus caudafurcatus, LESUEUR (1819), Memoires du Museum, v, 152. 
Amiurus caudafurcatus, GUNTHER (1864), Catalogue of Fishes, v, 102. 
Silurus maculatus, RAFINESQUE (1820), Quarterly Journal of Science, Bee and 
Arts, London, 48 (et var. erythroptera, p. 49). 
Pimelodus (Ictalurus) maculatus, RAFINESQUE (1820), Ichthyologia Ohiensis, 62. 
Silurus pallidus, RAFINESQUE (1820), Quart. Journ. Sci. Lit. and Arts, London, 49 (et var. 
marginatus, lateralis, leucoptera). 
Pimelodus pallidus, RAFINESQUE (1820), Ich. Oh., 63.—KIRTLAND (ese); Report Zool. 
Ohio, 169, 194. 
