454 DRIVER— THE LUCIOPIMELODIN^. 



The species of Lucio pimclodincc have so far been recorded from 

 the La Plata Basin, from the Rio Jauri at the headwaters of the 

 River Paraguay to the mouth of the La Plata at Buenos Aires, from 

 the Amazon between Calderon and Para, from the Essequibo Basin 

 in Guiana and from the Magdalena Basin in transandean Colombia. 

 Their distribution is very wide which may indicate that they have 

 been established in South America since before the days of the for- 

 mation of the eastern Andes of Colombia. 



Synonymy and Bibliography. 



LuciOPiMELODUS PATi ( Valcncienncs) . 



Pimelodiis pati Valenciennes, Voy. d'Orbigny, pi. i, figs. 7-9, 

 1847; Cuv. & Val., Hist. Nat. Poiss., XV, 176, 1840 (Parana; 

 La Plata ; Corrientes ; Buenos Ayres) ; Kner, Sb. Ak. Wien, 

 XXVI, 1857, 416 (Forte de S. Joaquim, Rio Branco) ; 

 Giinther, Cat. Fish. Brit. Mus., V, 128, 1846 (copied). 



Luciopimelodus pati Eigenm. & Eigenm., Proc. Calif. Acad., 2d 

 Ser., Vol. I, 122 (Buenos Ayres) ; Eigenmann, Repts. Prince- 

 ton Univ. Expcd. Patagonia, III, 1910, p. 383 (name only) ; 

 Fisher, y^wM. Carnegie Mus., XI, 1917, p. 407 (Buenos Aires). 



Habitat: Rio Plata ; Rio Branco near British Guiana. 

 Megalonema platanum (Giinther). 



Pimclodiis platanus Giinther, Ann. Nat. Hist. (5), VI, 10, 1880 

 (Parana, Rio Plata). 



Luciopimelodus platanus Eigenm. & Eigenm., Occasional Papers 

 Calif. Acad. Sci., I, p. 108, 1890; Eigenmann, Repts. Prince- 

 ton Univ. Exped. Patagonia, III, 1910, p. 383 (name only) ; 

 Fisher, Ann. Carnegie Mus., XI, 191 7, p. 408 (Rio Jauru, 

 Asuncion). 



Habitat: Rio Plata; Piracicaba ; Paraguay Basin. 

 Megalonema platycephalum (Eigenmann). 



Megalonema platycephalum Eigenmann, Repts. Princeton Univ. 

 Exped. Patagonia, III, 1910, p. 383 (name only) ; Eigen- 

 mann, Mem. Carnegie Mus., V, 1912, p. 150, PI. X, jfig. 2. 



Habitat: Essequibo Basin. 



