EIGENMANN : FRESH WATER FISHES. 361 



12. Hoplias. Chagres and Magdalena to Trinidad, La Plata, Para and 

 Huallaga, p. 355. 



13. Oirimatus. Magdalena to Trinidad and La Plata; Para to Hual- 

 laga and Canelos, p. 356. 



14. Prochilodus. Magdalena to the La Plata and Peru, p. 356. 



15. Luciocharax. Magdalena, p. 358. 



16. Astyanax. Magdalena to the United States, Trinidad and La 

 Plata and Peru, p. 354. 



17. Hemibrycon. Peru, Ecuador and Trinidad, p. 358. 



18. Clieirodon. Magdalena south to San Francisco, La Plata and Chili, 



P- 358. 



19. Gasteropelecus} Pacific slope of Panama, Essequibo, Amazons and 



southeast Brazil, p. 357. 



20. Brycon. Magdalena to Guatemala and La Plata, San Francisco, 

 Ambyiacu, p. 354. 



21. Creagruiiis. Magdalena to Rio das Velhas. Few species widely 

 separated, an old genus?, p. 359. 



22. Eigemnaiinia. Magdalena to Rio San Francisco and La Plata, 

 Para to Pebas, Parana, p. 355. 



23. Steynopygns. Magdalena to Paraguay and Rio Canelos, San 

 Francisco, p. 357. 



24. Synbranclms. Magdalena to RioMotagua, Trinidad, La Plata, p. 354. 



25. Alqnideiis. Magdalena to La Plata, p. 355. 



All of these show their ability for adaptation and colonization by their 

 wide distribution. The probable route of transit is up the Atrato and 

 down the San Juan, or up the Chagres and down the Pacific side of Panama. 



Conspicuous exceptions are the genera Cheirodon, Hemiancistnts and 

 the Cetopsince, a group which, until the present, has been considered a 

 single genus. I am entirely at a loss to account for the presence of 

 Cheirodon in Chili and no interoceanic channel in the region of the 

 Amazon would help us to account for its presence in Chili or in Patagonia.^ 



' Inclusive of the genus Thoracocharax. 



■ The Cetopsina are found on the Atlantic slope throughout the length of the Amazons to the 

 Huallaga in Peru and up the Napo to the mountain streams about Canelos, Ecuador, and 

 are also found directly across the Andes from Canelos in the Guayaquil. The inference is 

 obvious. Paracetopsis has succeeded in getting across the Andes of Ecuador at a sufficiently 

 long time ago to enable the Guayaquil form to become generically and specifically distinct. 

 Hemiancistrns has a similar distribution, being also found on the western slope of Panama. 



