122 MEMOIRS OF THE CARNEGIE MUSEUM 



4. Aspredinichthys tibicen (Temminck). 

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

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

 1848, 630 (coast of Guiana).— Gunther, Catalogue, V, 1864, 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 hyaline, 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: 



