EIGENMANN: the freshwater fishes of BRITISH GUIANA 201 



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



Silurus nodosus Block, 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 MuLLERand Troschel, Hora^ Ichth., Ill, 1849, 11. — Kner, 



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

 FeZic/ii/iys nodosw.s 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). 

 Parauchenipierus 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. U. Cat. No. 12099.) 



Head 4.2; depth 45-4.75, D. 1,6; A. 21 or 22; Y. 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 emarginatc. 



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. 



