122 MEMOIRS OF THE CARNEGIE MUSEUM 



4. Aspredinichthys tibicen (Temminck). 

 Aspredo tibicen (Temminck) Cuvier and Valenciennes Hist. Nat. Poiss., XV, 

 1840, 438 (Surinam). — MtJLLER and Troschel, in Schomburgk, Reisen, III, 

 1848, 630 (coast of Guiana).— Gunther, Catalogue, V, 18G4, 270 (British 

 Guiana). — Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., XIV, 1891, 26. 

 Platystacus tibicen Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), II, 

 1889, 50; Occasional Papers Cal. Acad. Sci., I, 1890, 24 (Caruca; Rio Muria). 

 Aspredinichthys tibicen Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 118. — Eigen- 

 mann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 381. 

 Large series of individuals up to a length of almost 215 mm. from the George- 

 town market. Evidently the most abundant of the banjomans. (C. M. Cat. No. 

 1552a-o; I. U. Cat. No. 11970.) 



Distance from snout to dorsal plate nearly 5 in the length to the caudal; 

 width of head about equal to its length to the upper angle of the gill-opening; 

 depth of head about half its width; D. 5, the last ray adnate, the first much pro- 

 longed, its length in the adult equal to its distance from the eye or longer, not much 

 produced in the young. A. 51-58, the last ray adnate. 



Head pointed, width of mouth one-third width of head, snout produced be- 

 yond the mouth for about one-third the width of the latter; eye rather large, 

 almost half the width of the interorbital; maxillary barbels about reaching gill- 

 openings, adnate for about one-fourth their length; maxillary barbel with a barbel 

 opposite the corner of the mouth; a series of barbels behind it on the lower surface 

 of the head and breast to about the base of the pectoral. A pair of mental barbels 

 nearly equidistant from each other and from the mouth, not reaching the post-mental 

 barbels, which are nearly twice as far apart ; lower surface of head warty ; a round 

 pectoral pore below the tip of the humeral process; inner margin of pectorals with 

 spines increasing toward the tip, those of the outer margin pointed toward its tip. 

 Slaty, irregularly marked with squarish darker blotches on the back; ventrals 

 and anterior part of anal hyahne, other fins slate or blue-black. 



I examined two specimens of this species in the Museum at Leiden from 



Surinam. 



Aspredo Bleeker. 



Aspredo {ex Linnaeus, Mus. Adolphi Fred., 1754, 73) Bleeker, Nederl. Tijdschr. 



Dierk., I, 1863, 117 (batrachus). 



Type, Aspredo batrachus Gronow = Aspredo aspredo (Linnaeus). 



Distinguished by the absence of marginal tentacles on the head and breast 

 and by having a basal barblet on the maxillary. Snout without hooks. 



Two species, distinguished thus: 



