eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 355 



Origin of dorsal nearer to snout than to caudal, 3.4 in the length; anal emargi- 

 nate, its origin about equidistant from snout with the eighth dorsal ray; ventrals 

 reaching anal, their origin a little in advance of that of the dorsal. Pectorals 

 reaching beyond origin of ventrals. 



A conspicuous parabolic humeral spot, the blunt end forward, and a faint 

 dark streak extending below it; a diffuse caudal spot occupying the entire width 

 of the end of the caudal peduncle. 



Dorsal line dark; sides profusely covered with pigment cells, disappearing on 

 the belly; cheeks and opercles dotted; fins dotted; upper and lower margin of caudal 

 dark. Straw-colored in life; bases of dorsal, anal, and caudal lobes ochreous. 



215. Astyanax wappi (Cuvier and Valenciennes). (Plate LII, fig. 1.) 

 Tetragonopterus wappi Cuvier and Valenciennes, Hist. Nat. Poiss., XXII, 



1848, 153 (Guiana).— Gunther, Catalogue, V, 1864, 326 (British Guiana) .- 



Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., XIV, 1891, 53. — Ulrey, 



Ann. N. Y. Acad. Sci., VIII, 1895, 278. 

 Astyanax wappi Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 



433. 



I have examined the type, No. 2336, Jardin des Plantes, 105 mm. in total 

 length. Head 3.33; depth 3; scales 6-36-5 (type), 7-38-6; eye 1.5 in the very 

 convex interorbital, 1 in snout, 4 in head; A. 27; maxillary with one tooth; predorsal 

 line scaled. Dorsal and anal profile about equally arched; second preorbital 

 striate; a large oval humeral spot, twice as long as high; a dark caudal spot ex- 

 tending forward on the sides; traces of longitudinal streaks between the rows of 

 scales. The figure is based on a specimen in the British Museum. 



It is quite possible that both specimens said to have come from Guiana (the 

 one in Paris and the one in London) actually came from the Branco basin, and 

 should therefore be excluded from this account. 



Poscilurichthys Gill. 

 Poecilurichthys Gill, Ann. Lye. Nat. Hist. N. Y., VI, 1858, 414. 

 Like Astyanax, except that the predorsal line is naked. 

 Type, Poecilurichthys brevoortii Gill. 



a. Scales 42-50. 



6. Lateral line 42-40; a round .spot over the seventh to ninth scale of the lateral line; no caudal spot. 



polylepis. 

 bb. Lateral line 43-51; a narrow ovate spot over the first five scales of the lateral line; a large caudal spot. 



abramoides. 



