336 MEMOIRS OF THE CARNEGIE MUSEUM 



Humeral spot distinct, vertically elongate, paralleled in front and behind by a 

 l)right bar nearly as wide as the spot; a secondary, fainter, dark bar behind the 

 posterior bright bar. A black caudal spot not extending much, if at all, ui)on the 

 middle caudal rays; a bright ring around the entire caudal peduncle. The base 

 of the caudal lobes and upper ])art of the peduncle rusty red in life. Dorsal orange- 

 tinged in life; caudal and anal rays tip])ed with dusky, distal third of second anal 

 rays white. Anal, ventrals, and pectorals yellow in life. Scales of the back 

 outlined with pigment; a few large chromatophores scattered over the cheeks. 



193. Hemigrammus iota Durbin. (Plate XLIX, fig. 1.) 

 Hemigrammus iota Durbin, Ann. Carnegie Mus., VI, 1909, 60. — Eigenmann, 



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



Type, 18 mm. Gluck Island. (Carnegie Museum Catalog of Fishes No. 1458.) 



Cotypes, four specimens, 19-21 mm. Rockstone. (C. M. Cat. No. 1460a; 

 I. U. Cat. No. 11914.) 



Cotj^pes, seven specimens, 18-21 mm. Gluck Island. (C. M. Cat. No. 

 U59a-b; I. U. Cat. No. 11913.) 



Head 3.6; depth 3.4; D. 11; A. 15-17; scales 5-30-3; eye 2.33-2.5; snout 

 three-fifths of the eye. Interorbital slightly less than the eye, 2.8 in the head. 



Humeral spot conspicuous, black, vertically elongate, surrounded by a small 

 light area; a faint secondary spot. Caudal spot variable in intensity, not extending 

 upon the caudal rays, and not continuous with the narrow black lateral stripe, which 

 is overlaid with silvery. Each scale of the postdorsal region marked with a round 

 dark spot in addition to a few scattered chromatophores. Scales of the predorsal 

 region with less distinct round spots. Scales of the sides above the lateral stripe 

 outlined with dusky. Caudal in life with an orange spot on the base of each lobe. 



194. Hemigrammus orthus Durbin. (Plate XLVIII, fig. 5.) 



Hemigrammus orthus Durbin, Ann. Carnegie Mus., \T, 1909, 61. — Eigenmann, 



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



Type, 28 mm. Tukeit. (Carnegie Museum Catalog of Fishes No. 1477.) 



Cotypes, seventeen specimens, 22-30 mm. Tukeit. (C. M. Cat. No. 1478a-/; 

 I. U. Cat. No. 11912.) 



Cotypes, twenty-five specimens, 14-21 mm. Gluck Island. (C. M. Cat. 

 No. 1479a-/; I. U. Cat. No. 11922.) 



Cotype, one specimen, 27 mm. Essequibo below Packeoo. (C. M. Cat. 

 No. 1480.) 



