eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 357 



than the parietal, extending to above the anterior margin of the pupil; margin of 

 second suborbital very convex, leaving but a narrow naked margin; maxillary 2.66 

 in the head, the mouth large. Four to six teeth in the front row of the premaxillary, 

 the third withdrawn from the line of the rest; five teeth in the second series, their 

 denticles in a straight line; eight large teeth in the lower jaw (four on each side) 

 arranged in a crescent; small teeth on the side. 



Scales of the sides and back regularly imbricated; a few interpolated scales over 

 the anal muscles; a row of about twelve scales forming a sheath along the base of 

 the anterior rays. Scales of belly and breast not very regularly arranged; lateral 

 line but little decurved; axillary scale well-developed. 



Dorsal equidistant with the ventrals from the snout, its origin a little in ad- 

 vance of the middle, its highest ray 3.5 in the length; anal emarginate; ventrals 

 not reaching anal; pectorals slightly beyond origin of ventrals. 



Highly iridescent; a round spot over the seventh to the ninth scale of the 

 lateral line, with a dark streak extending down from it and another curving upward 

 and forward, surrounded by a lighter area; sides and fins thickly punctate, especially 

 in a lateral band on a level with the humeral spot. Tip of first anal ray sometimes 

 milk-white. 



217. Poecilurichthys abramoides (Eigenmann). (Plate LII, fig. 4.) 



Tctragonoptcrus abramis (not of Jenyns) Gunther, Catalogue, V, 1864, 321 (British 

 Guiana; Essequibo). — Steindachner, "Flussfische Sudamerika's, " i, 1879, 8 

 (Orinoco near Ciudad Bolivar). 



Astyanax abraynoides Eigenmann, Ann. Carnegie Mus., VI, 1909, 21; Repts. Prince- 

 ton Univ. Exp. Patagonia, III, 1910, 432. 

 Type, 112 mm. Tumatumari. (Carnegie Museum Catalog of Fishes No. 



1028.) 



Cotypes, eighty-six specimens, 48-112 mm. Tumatumari. (C. M. Cat. No. 



1029r ( -j; I. U. Cat, No. 11727.) 



Cotypes, two specimens, 99-126 mm. Potaro Landing. (C. M. Cat, No. 



1030; I. U. Cat. No. 11728.) 



Cotypes, twenty-seven specimens, 60-126 mm. Kangaruma. (C. M. Cat. 



No. 1031a-e; I. U. Cat, No. 11729.) 



Cotypes, forty-eight specimens, 56-108 mm. Amatuk Cataract, (C. M. 



Cat. No. 1032a-,/; I. U. Cat. No. 11730.) 



Cotype, one specimen, 54 mm. Rockstone. (C. M. Cat. No. 1033.) 

 Cotype, one specimen, 46 mm. Gluck Island. (C. M. Cat, No. 1034.) 



