ANNOTATED LIST OF THE SPECIES 249 
Colossoma bidens Kigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 444; 
Norman, 1928, Proe. Zool. Soe. London, 810. 
Colosoma bidens Eigenmann, 1915, Ann. Carnegie Mus., EX, 262. 
The Amazons 
15670, 2, 118 and 154 mm., Contamana, Allen, August, 1920. 
15671, 2, 144 and 147 mm., Manaos, Allen, December, 1920. 
15672, 3, 130-166 mm., Yarinacocha, Allen, August, 1920. 
15701, 3, 126-130 mm., Lago Cashiboya, Allen, August, 1920. 
304. COLOSSOMA HERNIARIUM (Cope) 
Myletes herniarius Cope, (1871), 1872, Proc. Acad. Nat. Sci. Phila., X XIII, 268, pl. xii, fig. 3, R. 
Ambyiacu, Hauxwell collection; 
Cope, 1878, Proc. Amer. Phil. Soc., X VIII, 693, Peruvian Amazon, Orton collection. 
Colossoma herniartum Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITT, 444. 
Starksina herniarius Fowler, 1906 (1907), Proe. Acad. Nat. Sei. Phila., LVIII, 476. 
Mylossoma aureum Norman, 1928, Proc. Zool. Soc. London, 812; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 271. 
Peruvian Amazon 
Genus 117: MYLOSSOMA Eigenmann 
Mylossoma Eigenmann, 1903, Smithson. Mise. Coll., XLV, 148; 
Bigenmann and Kennedy, 1903, Proc. Acad. Nat. Sei. Phila., 350; 
Kigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 444; 
Ahl, 1922, Wochen Aquar.-Terrarienkunde, no. 11. 
Mylosoma EFigenmann, 1915, Ann. Carnegie Mus., [X, 261, 265. 
Starksina Fowler, 1906 (1907), Proce. Acad. Nat. Sei. Phila., LVIII, 476. 
Type: Myletes albiscopus Cope 
Orinoco to La Plata 
Differing from Colossoma in the numerous supplementary scales which may 
obscure the primary scales; anal scaled at least its proximal half, and its rays in- 
creasing toward the last; length of anal base equals or surpasses half the length of 
the fish without the caudal; operculum with a narrow lobe; gill-rakers of moderate 
length. 
305. MyYLOSSOMA AUREUM (Spix) 
Myletes aureus Spix, 1829, Sel. Gen. et Spec. Pisce. Bras., 74, pl. xxxi. 
Mylossoma aureum Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 444; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sei. Phila., XCI, 271, seven, 83-173 mm., Contamana. 
Mylosoma aureum EFigenmann, 1915, Ann. Carnegie Mus., IX, 265. 
Orinoco to Ucayali and La Plata 
306. MyLOSSOMA DURIVENTRE (Cuvier) 
Myletes duriventris Cuvier, 1818, Mém. Mus. Hist. Nat., IV, 451, pl. xxii, fig. 2; 
Cuvier and Valenciennes, 1848, Hist. Nat. Poiss., XXII, 206; 
Ginther, 1864, Cat. Fish. Brit. Mus., V, 375; 
