eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 201 



71. Pseudauchenipterus nodosus (Bloch). (Plate XX, fig. 2.) 



Silurus nodosus Bloch, Ausl. Fische, VIII, 1794, 35, pi. 368, fig. 1 (Tranque- 



bar?). — Bloch and Schneider, Syst. Ichth., 1801, 383. 

 Arius nodosus Cuvier and Valenciennes, Hist. Nat. Poiss., XV, 1840, 70 



(copied). 

 Auchenipterus nodosus MtJLLERand Troschel, Horse Ichth., Ill, 1849, 11. — Kner, 



SB. Akad. Wiss. Wien, XXVI, 1857, 424 (Surinam).— Gunther, Catalogue, 



V, 1864, 194 (British, Dutch, and French Guiana). 

 Pseudauchenipterus nodosus Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 88 (name 



only); " Silures de Suriname," 1864, 43, pi. 11, fig. 1, pi. 13, fig. 6 (Surinam). 



—Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 396. 

 Felichthys nodosus Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), I, 1888, 



154 (Para; Bahia); Occasional Papers Cal. Acad. Sci., I, 1890, 291. 

 Auchenipterus furcatus Cuvier and Valenciennes, Hist. Nat. Poiss., XV, 1840, 



211 (Guiana). — Muller and Troschel, in Schomburgk, Reisen, III, 1848, 629 



(Essequibo) . 

 Pseudauchenipterus guppyi Regan, Proc. Zool. Soc. London, 1906, 387 (Trinidad). 

 Par auchenipterus paseadw Regan, Proc. Zool. Soc. London, 1906, pi. 23. 



Twenty specimens, 210-290 mm. Georgetown market. (C. M. Cat. No. 

 1723a-e; I. U. Cat. No. 12097.) 



Three specimens, 137-145 mm. Mahaica. (C. M. Cat. No. 1724a; I. U. 

 Cat, No. 12098.) 



Two specimens, 212 and 227 mm. Mud-flats of Demerara River, near Wismar. 

 (C. M. Cat. No. 1725a; I. IT. Cat. No. 12099.) 



Head 4.2; depth 45-4.75, D. 1,6; A. 21 or 22; V. 8; P. 1,7. Eye about 1 

 in snout, 4.25 in head, 2.5 in interorbital. 



Subtriangular in front, the head blunt, the tail compressed; maxillary barbel 

 reaching posterior third of pectoral spine, mental barbel beyond base of pectoral, 

 post-mental to middle of pectoral spine; head nearly as broad as long; frontal 

 bones pitted, not much swollen; lower jaw included. 



Dorsal spine 3-3.6 in the length, feebly serrate behind; pectoral spine 3.5-3.75 

 in the length, its outer margin striate, its inner finely serrate. Caudal forked; 

 anal slightly emarginate. 



Back and sides dark blue; an undulating white streak follows the lateral line, 

 dividing with it on the caudal; area above anal lighter than the rest of the sides; 

 upper and lower margin of caudal light, the hinder margin black; tips of remaining 

 fins light. 



