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ANNOTATED LIST OF THE SPECIES 
Eigenmann, 1912, Mem. Carnegie Mus., V, 389; 
Eigenmann, 1915, Ann. Carnegie Mus., IX, 269; 
Ahl, 1923, Mitt. Zool. Mus. Berlin, XI, 21; 
Norman, 1928, Proc. Zool. Soc. London, 819. 
Guianas to Rios Huallaga, Guaporé, and Paraguay 
Genus 114: MYLEUS Miller and Troschel 
Myleus Miller and Troschel, 1845, Horae Ichth., I, 24; 
Higenmann, 1912, Mem. Carnegie Mus., V, 393. 
Type: Myleus setiger Miller and Troschel 
Orinoco and Guianas to Rios Sao Francisco and Paraguay 
Belly trenchant, like the preceding, the serrae obsolescent with age; the two 
series of premaxillary teeth closely approximated, the outer protruding and incisor- 
like; mandible with a pair of conical teeth in front; anal faleate in female, bilobed 
in male; dorsal rays filamentous in male. 
300. MyLeus SeTIGER Miller and Troschel 
Myleus setiger Miller and Troschel, 1845, Horae Ichth., I and II, 21 and 39, pl. xi, fig. 1; 
Norman, 1928, Proc. Zool. Soc. London, 821, Guianas to Matto Grosso; 
Fowler, 1939 (1940), Proce. Acad. Nat. Sei. Phila., XCI, 272, one, Contamana. 
Myleus pacu EKigenmann, 1912, Mem. Carnegie Mus., V, 394. 
Guianas to Matto Grosso and Peru 
Genus 115: PIARCTUS Eigenmann 
Piarctus Kigenmann, 1903, Smithson. Mise. Coll., XLV, 148; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 443. 
Colosoma Bigenmann, 1915, Ann. Carnegie Mus., [X, 261. 
Colossoma (in part) Norman, 1928, Proc. Zool. Soc. London, 808. 
Type: Myletes brachypomus Cuvier 
Orinoco basin to that of La Plata 
Predorsal spine wanting; anal not scaled, and as long as the head or shorter, 
first rays highest, fin without lobes. Separated from the nearby Colossoma on the 
rayed adipose and broad membrane bordering the operculum; gill rakers fine and 
numerous. 
301. PIARCTUS NIGRIPINNIS (Cope) 
] 
Myletes nigripinnis Cope, 1878, Proc. Amer. Phil. Soc., XVII, 693, Nauta and R. Ambyiacu; 
Steindachner, 1881, Denksch. IKK. Akad. Wiss. Wien, XLITI, 25, pl. vu, fig. 1; 
Bigenmann and Higenmann, 1891, Proc. U. S. Nat. Mus., XIV, 61. 
Colossoma nigripinnis Eigenmann, 1903, Smithson. Mise. Coll., XLV, 148; 
EKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 444; 
Norman, 1928, Proce. Zool. Soe. London, 811. 
