eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 341 



Nineteen hundred and seventy-seven specimens, 24-30 mm. Dr. Justa, Brazil 

 (Maj. Cotinho, Thayer Exp.). (Mus. Comp. Zool. No. 21008.) 



Four specimens, 20-24 mm. Para, Brazil. (I. U. Cat, No. 5176.) 

 One specimen, 27 mm. Lower Amazon. (I. U. Cat. No. 5177.) 

 One specimen, 44 mm. Ica (James). (Mus. Comp. Zool. No. 20812.) 

 Sixteen specimens, 19-24 mm. Gluck Island. (C. M. Cat, No. 1247; I. U. 

 Cat, No. 11772.) 



Head 3-3.5; depth 3-3.5; D. 10, occasionally 11; A. 17-24; scales 5-29 to 

 34-3.5 or 4, six to thirteen pores in the lateral line; eye 2-2.5 in the head; inter- 

 orbital little less than the eye, 2.7-3 in the head. 



All of the fins hyaline, except for the occasional dim spot at the base of the 

 caudal, which never reaches the end of the caudal rays. A distinct silvery lateral 

 stripe subtending a very inconspicuous, narrow, brown, or black stripe. The 

 scales, especially those of the lateral line and the series above and below it, are 

 iridescent, 



201. Hyphessobrycon minimus Durbin. (Plate XLIX, fig. 2.) 

 Hyphessobrycon minimus Durbin, Ann. Carnegie Mus., VI, 1909, 68. — Eigen- 

 mann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 436. 

 Type, 18 mm. Cane Grove Corner. (Carnegie Museum Catalog of Fishes 

 No. 1193.) 



Cotypes, 16-21 mm. Cane Grove Corner. (I. U. Cat. No. 11769.) 

 Head 3.33-3.66; depth 3.5-3.75; D. 11; A. 16 or 17; scales 5-30 to 33-3; 

 eye 2+ in head; snout less than eye; interorbital less than eye, about 3 in head. 



Caudal spot intensely black, roundish, and scarcely, if at all, continued upon 

 the caudal rays. Humeral spot lacking, but the intense narrow black lateral 

 stripe widened somewhat in the humeral region. Scales of the back and sides, above 

 the lateral stripe, heavily outlined with dusky. Fins without distinct markings of 

 black or white. Sides over and below the lateral stripe marked with iridescent 

 steel-blue. Preopercle also with blue iridescence. 



202. Hyphessobrycon eos Durbin. (Plate L, fig. 2.) 

 Hyphessobrycon eos Durbin, Ann. Carnegie Mus., VI, 1909, 69. — Eigenmann, 



Repts. Princeton Univ. Exp. Patagonia, III, 1910, 437. 



Type, 36 mm. Creek between Potaro Landing and Kangaruma. (Carnegie 

 Museum Catalog of Fishes No. 1194.) 



Cotypes, twenty-four specimens, 35-42 mm. Creek between Potaro Landing 

 and Kangaruma. C. M. Cat, No. 1196o-e; I. U. Cat, No. 11770.) 



