250 FISHES OF WESTERN SOUTH AMERICA 
Giinther, 1868, Proc. Zool. Soc. London, 229, 247, Xeberos; 
Cope, 1870, Proc. Amer. Phil. Soc., XI, 566, Pebas; 
Steindachner, 1882 (1883), Denksch. Kx. Akad. Wiss. Wien, XLVI, 16, Rio Huallaga, four 
specimens. 
Mylossoma duriventris Norman, 1928, Proc. Zool. Soc. London, 813; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., NCI, 272, nine, 65-125 mm., Contamana. 
Orinoco, upper Amazons, La Plata systems 
Both Steindachner and Fowler report the local name Palometa for the species; 
I found the name used for all the thinner members of the subfamily, to which the 
name Pacu could not be applied. 
Fic. 28. The mouth of the Rio Itaya, at Iquitos, looking out into the Amazon. 
307. MyLOSSOMA ALBISCOPUM (Cope) 
Myletes albiscopus Cope, 1871 (1872), Proc. Acad. Nat. Sci. Phila., XXIII, 267, pl. xii, fig. 1, many 
Rio Ambyiacu, Hauxwell coll. 
Mylossoma albiscopus Eigenmann, 1903, Smithson. Mise. Coll., XLV, 148. 
Mylosoma albiscopus EKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IT, 444. 
Mylossoma duriventris Norman (in part), 1928, Proc. Zool. Soc. London, 813; 
Fowler (in part), 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 272. 
Peruvian Amazon 
15601, 15611, 15674, 15679, 29, 103-234 mm., Lago Sanango, Allen, November, 1920. 
15612, 1, 118 mm., Rio Maranon, below Pastaza, Allen, October, 1920. 
