128 Bulletin 4j, United States National iMmeum. 



185. NETUMA ELATTURA, (Jordan & Gilbert). 



Head 3;|. A. 18. Mouth rather large; vomerine teeth rather coarse; 

 palatiue patches small; barbels rather short; occipital process short, 

 broadly triangular, with concave sides, the base abruptly broadened: 

 median keel well developed; foutanelle broad and shallow, with a narrow 

 groove behind, nearly reaching occipital process; shields roughiah, but 

 smoother than in N. kesskri ; barbels rather short ; caudal short, 1^' in 

 head. Panama; scarce. (tAdrrui', reduced; ofpti, tail.) 



AriuH elaUuru&, Jordan & Giluekt, (. c, 45, 1882, Panama. 



73. HEXANEMATICHTHYS, Bleeker. 



186. HEXANEMATICHTHYS FELIS, (Liima-us). 

 (Sea Catfish.) 



Head "dl ; depth 5. D. I, 7 ; P. I, 6; A. 16. Body rather elongate, not 

 compressed, tapering into the slender tail; head eubconic, depressed, 

 flattish above; maxillary barbel nearly as long as the head; gill mem- 

 branes broadly united, forming a narrow, free fold across the isthmus; 

 occipital process with a median keel, long, about \ head, its tip convex ; 

 foutanelle forming a narrow groove; top of head comparatively smooth; 

 humeral process nearly i the length of the pectoral spine ; caudal deeply 

 forked, the upper lobe the longer. Steel blue, sides and belly silvery, 

 lower tins pale. L. 24 inches. Cape Cod to Texas; common southward 

 along the sandy coast, the most abundant of the salt-water catfishes on 

 the United States coast, and the only one of the Tachi/aurua type found 

 much north of the Tropic of Cancer, (felis, cat.) 



Silurus felis, Linn.'EUS, Syst. Nat., Ed. xii, 503, 17GG, Charleston, S. C. 



Arius lailberli, CuviEK & Valenciennes, xv, 74, 1840, New York ; Charleston. 



Arats milberti, GCnther, Cat., v, 155, 18G4. 



Arms eijiiedris, Baird & Giraud, Proc. Ac. Nat. Sci. Phila., 1855, 'M, Indianola, Texas. 



Arius equefiliui, Gunther, Cat., v, 173, 18G4. 



Arius felis and equeslris, Jordan & Gilbert, Synopsis, 110, 1883. 



187. HEXANEMATICHTHYS SEEMAXI, (Giinther). 



Head 3J. A. 18. Head flat, depressed in front, its shields coarsely 

 granular; occipital process wider than long, with a bluntish keel ; fou- 

 tanelle opeu to above the posterior margin of the eye, with a deep back- 

 ward extending groove; barbels reaching slightly beyond base of pectorals; 

 vomerine teeth in 2 small ovate patches; each joined to a larger palatiue 

 I)atch; axillary pore large; gill rakers 5 -f 12. Paired tins dusky within. 

 Panama. (Named for Dr. Seeman, who obtained the type.) 



Arius scanaui, Gvnther, Cat., v, 147, 1864, "Central America" 



Tachisitriis seemani, Eioenmann, S. A. Nematognathi, 78, 1890. 



188. HEXANEMATICHTHYS JORDAXI, (Eigenmanu A Eigenmaun.) 



Head 3^. A. 18. Rather robust; interorbital area flat and smooth; 

 shields of head finely and sparsely granular; opercle smooth; occipital 

 process about as loug as head, with au unusually sharp keel ; foutanelle 



