284 MEMOIRS OF THE CARNEGIE MUSEUM 



ami. Like harrisoni, the chocolate of the back bordered by a darker line, a dark streak from behind the base 



of the lower pectoral rays to and along base of the anal erythrurus. 



aaaa. A dark band from snout to and including the lower caudal lobe; an oblique ocellated spot above the 

 middle of the caudal ocellatus. 



140. Pcecilobrycon harrisoni Eigenmann. (Plate XXXVII, fig. 1.) 

 Pa?cilobrycon harrisoni Eigenmann, Ann. Carnegie Mus., VI, 1909, 43; Repts. 



Princeton Univ. Exp. Patagonia, III, 1910, 427. 



Type, 55 mm. Canal at Christianburg. (Carnegie Museum Catalog of Fishes 

 No. 1160.) 



Cotypes, two specimens, 45-51 mm. Canal at Christianburg. (I. U. Cat. 

 No. 11709.) 



Head 4; depth 5.25; D. 9; A. 10; five scales between dorsal and ventral, 

 twenty-six or twenty-seven in a median series, eleven or twelve in front of the 

 dorsal; eye 3 in the head; upper jaw projecting. Snout very little greater than 

 eye; interorbital a little less than eye. 



Adipose well-developed, behind tip of anal; origin of dorsal slightly posterior 

 to that of the ventrals. Pectorals reaching half-way to ventrals; ventrals slightly 

 more than half-way to anal. 



Back chocolate; a broad straw-colored band from tip of snout to middle of 

 upper caudal lobe; a narrow black band from tip of mandible through eye along 

 lower part of peduncle to near tip of shortest caudal ray, and a few rays inferior to 

 it. Ventral surface silvery, dotted from midway of the ventrals to the anal, the 

 dots continued over the lateral band above the anal. A spot on either side of 

 snout, the iris dorsad, a line along base of anal, and a streak above and below 

 the caudal band, crimson. An oblique, dotted bar across the yellow lateral band 

 just above tip of pectoral. Last anal rays dark. 



Similar to P. unifasciatus, in which the color from the dark lateral bands across 

 the back is uniform, i. e., lacking the straw-colored band above the dark band. 



Named for Mr. J. B. Harrison, M.A., C.M.G., F.G.S., Government Geologist, 

 Georgetown, British Guiana, who assisted the expedition in various ways. 



141. Pcecilobrycon trifasciatus (Steindachner). (Plate XXXVII, fig. 2.) 

 Nannostomus trifasciatus Steindachner, "Ichthyologische Beitrage," v, 1876, 75, 

 pi. 9, fig. 2 (Lagunas of the Amazon near Barra do Rio Negro; Rio Negro; 

 Tabatinga). — Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., XIV, 

 1891, 49. — Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 427. 

 Pcecilobrycon auratus Eigenmann, Ann. Carnegie Mus., VI, 1909, 44; Repts. Prince- 

 ton Univ. Exp. Patagonia, III, 1910, 427. 



