ANNOTATED LIST OF THE SPECIES 281 
Type: Erythrinus unitaeniatus Spix 
Guianas via Peru to La Plata 
Unlike Hoplias in having teeth on the pterygoids as well as on the palatine 
bones: dorsal rounded; walls of air-bladder cellular. 
370. HopLERYTHRINUS UNITAENIATUS (Spix) 
Maturaque of Maregrave, 1648, Hist. Rer. Nat. Bras., IV, 169. 
Erythrinus unitaeniatus Spix, 1829, Sel. Gen. et Spec. Pise. Bras., 42, pl. xix; 
Miller and Troschel, 1845, Horae Ichth., I, 5, pl. ii, fig. 1; 
Cuvier and Valenciennes, 1846, Hist. Nat. Poiss., XTX, 486; 
Fig. 31. Seining the sand-bars of a group of islands of the Rio Huallaga, above Yurimaguas. 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 283; 
Ginther, 1868, Proce. Zool. Soc. London, 289; 
Steindachner, 1882 (1883), Denksch. KIx. Akad. Wiss. Wien, XLVI, 11; 
Regan, 1906, Proc. Zool. Soc. London, 382. 
Erythrinus (Ophiocephalops) unitaeniatus Fowler, 1906 (1907), Proce. Acad. Nat. Sci. Phila., LVIII, 
294, Maranon, Orton coll. 
Hoplerythrinus unitaeniatus Gill, 1895, Proc. U.S. Nat. Mus., XVIII, 208; 
Jigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 448; 
Higenmann, 1912, Mem. Carnegie Mus., V, 418; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sei. Phila., XCI, 275, one, 148 mm., Contamana. 
Peruvian Amazon to Bahia, La Plata, and Trinidad 
——, 1, 146 mm., brook at Iga, Rio Itaya, Allen, September, 1920. 
