418 MEMOIRS OF THE CARNEGIE MUSEUM 



300-400 mm. long, 1.6-2 in specimens 200-300 mm., 1.5 in specimens 100-200 

 mm., 1-1.3 in specimens between 50 and 100 mm. 



Very similar to H. macrophthalmus, but with a smaller eye and different color- 

 pattern. 



A median band in the young, broken up into vertical bars in older individuals, 

 and more or less uniform in the adult; fins all spotted or barred or both. 



In the larger specimens from Amatuk the color is almost plain black, while the 

 caudal and anal are crossed by narrow white lines; otherwise they are black. 

 In the Crab Falls specimen the caudal, anal, ventrals, and pectorals are black, 

 the tips lighter but without bands, the body black. In the Waratuk specimen 

 the fins are as in the Amatuk specimens, but the body is lighter and shows short 

 longitudinal spots with a lighter reticulation. 



This species is much more widely distributed than P. macrophthalmus. It is 

 found along the coast as well as above the Kaieteur Falls. 



HOPLERYTHRINUS Gill. 



Hoplerythrinus Gill, Proc. U. S. Nat. Mus., XVIII, 1895, 208. 



Ophiocephalops Fowler, Proc. Acad. Nat. Sci. Phila., 1906, 293. 

 Type, Erythrinus unitamiatus Bloch. 

 This genus differs from Erythrinus in having teeth on the pterygoids as well 



as on the palatines. 



268. Hoplerythrinus unitaeniatus (Spix). 

 "Wara" (of the Indians about Holmia); "Houri" (in the lowlands). 



" Maturaque " Marcgrave, Hist. Rer. Nat. Bras., IV, 1648, 169 (in standing water). 



? Synodontis palustris Bloch and Schneider, Syst. Ichth., 1801, 398 (Brazil). 



Erythrinus unitaeniatus Spix, Selecta Gen. et Spec. Pise. Bras., 1829, 42, pi. 19 (San 

 Francisco). — Muller and Troschel, Hora 1 Ichth., I, 1845, 5, pi. 3, fig. 1 

 (Brazil; Guiana). — Cuvier and Valenciennes, Hist. Nat. Poiss., XIX, 1846, 

 486 (Mana; Cayenne; Bahia). — Muller and Troschel, in Schomburgk, 

 Reisen, III, 1848, 632 (Canuku mountain streams). — Gunther, Catalogue, 

 V, 1864, 283 (Demerara; Surinam; Essequibo; River Capin, Para; Rio Cupai; 

 Bahia); Proc. Zool. Soc. London, 1868, 239 (Trinidad). — Steindachner, 

 " Siisswasserfische d. Siidostlichen Brasilien," 1874, 28 (Rio Parahyba; Victoria; 

 Bahia; Santarem; Villa Bella; Porto do Moz; Obidos; Cudajas; Curupira; 

 Tabatinga; Avary; Manes; Lago Jose Assu); "Flussfische Sudamerika's," iv, 

 1882, 11 (Rio Amazonas; Iquitos). — Eigenmann and Eigenmann, Proc. Cal. 

 Acad. Sci., (2), I, 1888, 105 (Sao Matheos; Rio Doce; Bahia; Para; Cudajas; 



