92 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY II. 



17. AMIUEUS XANTHOOEPHALUS, {Rafinesqiie) Gill, 



Small Yellow Catfish. 



(Figs. 42 and 43.) 



Silurus x(inthocq)liali(S, Raij. (lft-0), Quart. Jonrn. Sci. Lit. Arts, London, 51. 



Pimdodus xanihoccphalus, Raf. (1820), Icb. Ohieusis, 66.— Kiktlaxd (1838), Ropt. 



Zool. Ohio, 169, l'J4.— Storeu (1846), Synopsis, 405. 

 Amlurus xanthocephalus, Gii.\, (1862), Proc. Bost. Soc. Nat. Hist. 44. — Jordan & 



COPELAND (1876), Check List, 159.— Jordan (1877), Ann. Lye. Nat. Hist. 



N.Y. — . 

 Pimelodus catus, Kirtland Bost. .lonrn. Nat. Hist. v. 330. (excl. syn.). 

 Amiuriis albidus, Jordan (1376), Man. Vert. 302 (not Pimelodus albidas Le Sueur). — 



Nelson (1876), Bull. Ills. Mus. Nat. Hist. 50. 

 Am'mrus nehulosus, Jordan (1877), Proc. Acad. Nat. Sci. Phila. 45. 



EaUtat.—0\i\o Valley. 



Kafinesque'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 NIGRILABIIIS, {Co^e) Gill & Jordan. 



Blind Catfish. 



(Figs. 44 and 45.) 



Gronias nigrilahris, Cope (1864), Proc. Acad. Nat. Sci. Phila. 231.— Jordan (1876), 

 Mau. Vert. 304.— Jordan & Copeland (1876), Check List, 160. 

 Jniiurus nigrilahrits, Gill, MSS. 



Hahiiat. — 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. nigrilahris is apparently descended from A. ^ullus or some similar 

 species, its eyes being modified by its subterranean life. 



