1.18 Bulletin 47, United States National Museum. 



159. FELICHTHYS EYDOUXH, (Cuvier & Valenciennes). 



Head broader than in F. pinnimaculatus. Dorsal shield as long as broad, 

 the lateral edges rounded ; its surface granulated and grooved ; occipital 

 process narrower than in F. pinnimaculatus. Teeth on palate forming a 

 transverse band, subinterrupted in the middle. Maxillary barbel reach- 

 ing middle of pectoral spine. Dorsal spine grooved, granulated on 

 anterior edge ; pectoral filament reaching end of anal. Body and fins 

 uniformly colored, no black blotch on ventrals or anal. Head 4f . D. 1,7; 

 A. 30. Guayaquil. (Sauvage.) (Named for M. Eydoux, its discoverer.) 

 GaleicMhys eydouxii, CUVIER & VALENCIENNES, xv, 43, 1840, Guayaquil. 



Ailurichthys eydouxii, SAUVAQE, in Jordan, Proc. U. S. Nat. Mus., 1884, 40; description of original 

 type. 



160. FELICHTHYS FILAMENTOSUS, Swainson. 



Very close to F. marinus, which it represents southward. Shields on 

 top of head rougher than in F. marinus, the granulations extending on 

 each side of fontanelle to before it ; granulated area before occipital pro- 

 cess broader than long, its width more than \ head; occipital process 

 triangular, emarginate behind, its width at base 1 in its length ; basal 

 bone of dorsal spine short but broad. Dorsal spine a little shorter than 

 head, a little longer than pectoral spine; its filament reaching to or 

 beyond adipose fin ; pectoral filament to front of anal ; maxillary barbels 

 to end of pectoral spine. A. 26. Sandy coast of tropical America, on the 

 Atlantic side ; here described from specimens from Lake Nicaragua, (fila- 

 mentosusj bearing filaments.) 



Felichithys filamentosus, SWAINSON, Nat. Hist. Anim., n, 305, 1839, after Bloch, pi. 365. 

 AiluricWiys filamentosus, JORDAN, Proc. U. S. Nat. Mus., 1888, 411. 

 GaleicMhys blochii, CUVIER & VALENCIENNES, xv, 44, 1840, Bahia. 



181. FELICHTHYS MARINUS, (Mitchill). 



(SEA CATFISH; GAFF TOPSAIL.) 



Head rather short and broad, rounded anteriorly. Occipital buckler 

 small, oblong, not much broader before than behind; band of palatine 

 teeth nearly continuous, extremely variable. Maxillary barbels extend- 

 ing about to the end of the pectoral spine ; pectoral spine longer than the 

 dorsal spine, & the length of the head, its filament reaching the vent ; 

 dorsal filament reaching adipose fin ; upper lobe of caudal much the 

 longer; anal fin falcate. Dusky bluish, silvery below. Head 4^. D.I, 

 7; A. 23. P. I, 12; B. 6. Vert. 20 + 30. Cape Cod to Texas; common 

 southward; not valued as food. 



Silurus marinus, MITCHILL, Trans. Lit. and Phil. Soc. N. Y., i, 1815, 433, New York. 

 Ailurichthys marinus, GUNTHER, Cat., v, 178, 1864. 

 Ailurichthys marinus, JORDAN & GILBERT, Synopsis, 111, 1883. 

 Ailurichthys marinus, EIQENMANN, I. c., 36. 



162. FELICHTHYS BAHIENSIS, (Castelnau). 



Very close to F. marinus and perhaps not distinct, the pectoral spine 

 longer, as long as head, the maxillary barbels extending about to root of 

 ventral; palatine teeth in a very narrow band. A. 19 to 21. (Giinther.) 



