92 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY—II. 
17. AMIURUS XANTHOCEPHALUS, (Rafinesque) Gill. 
Small Yellow Catfish. 
(Figs. 42 and 43.) 
Silurus xanthocephalus, Rar. (1820), Quart. Journ. Sci. Lit. Arts, London, 51. 
Pimelodus xanthocephalus, Rar. (1820), Ich. Ohiensis, 66.—KiRTLAND (1838), Rept. 
Zoobl. Ohio, 169, 194.—STORER (1846), Synopsis, 405. 
Amiurus xanthocephalus, GILL (1862), Proc. Bost. Soc. Nat. Hist. 44.—JORDAN & 
COPELAND (1876), Check List, 159.—JoRDAN (1877), Ann. Lyc. Nat. Hist. 
N.Y. —. 
Pimelodus catus, KIRTLAND Bost. Journ. Nat. Hist. v. 330. (excl. syn.). 
Amiurus albidus, JoRDAN (1876), Man. Vert. 302 (not Pimelodus albidus Le Sueur).— 
NELSON (1876), Bull. Ills. Mus. Nat. Hist. 50. 
Amiurus nebulosus, JORDAN (1877), Proc. Acad. Nat. Sci. Phila. 45. 
Habitat.—Ohio Valley. 
Rafinesque’s description of this species is rather indifferent. Later 
writers seem to have overlooked the species altogether, or to have con- 
founded it with A. catus. It is certainly quite distinct from A. catus, 
and apparently from all the others here mentioned. The peculiar pro- 
file, wide head, as well as the short and small anal fin, are characteristic. 
These points are fairly shown in Dr. Kirtland’s otherwise bad figure of 
his Pimelodus catus. 
18. AMIURUS NIGRILABRIS, (Cope) Gill & Jordan. 
Blind Catfish. 
(Figs. 44 and 45.) 
Gronias nigrilabris, COPE (1864), Proc. Acad. Nat. Sci. Phila. 231.—JorpDAN (1876), 
Man. Vert. 304.—JORDAN & COPELAND (1876), Check List, 160. 
Amiurus nigrilabris, GILL, MSS. 
Habitat.—Cave streams tributary to the Conestoga River in Eastern 
Pennsylvania. 
The concealed condition of the eyes in this species is not considered 
by Prof. Gill as a character of sufficient importance to warrant its 
generic separation. 
A. nigrilabris is apparently descended from A. pullus or some similar 
species, its eyes being modified by its subterranean life. 
