622 EIGENMANN— ORIGIN OF FISHES OF THE 



will be coiisidered in a monograph on the fauna of Titicaca which 

 is in preparation. 



The genera with representatives in New Zealand or Australia 

 are marked *. The species found in both continents are marked f- 



The dry region between Copiapo and the Aconcagua is a region 

 of leftovers. The Aconcagua and the region south to the Bio Bio 

 may be termed Chilian. Here occurs one genus not found elsewhere, 

 Nematogcnys, and here occur the genera Basilichthys, Percichthys, 

 Percilia, Diplomyste that are peculiar to southern South America. It 

 also contains, as visitors, several lampreys. 



The region from the Bio Bio to near A^aldivia is distinguished 

 by the presence, in addition to most of the species of the central 

 Chilian region, of Galaxias, Aplochiton, not found north of the 

 Bio Bio, of Caragola, Valasia and Geotria, found occasionally 

 northward. Most of these are genera also found in and about 

 Australia and New Zealand. The genera Galaxias and Aplochiton 

 while present form but a small, inconspicuous portion of the 

 fauna. The region from Valdivia south to Puerto Alontt may be 

 termed Austro-Chilian. In this region while Percichthys and other 

 Chilian genera remain, the dominant genera are Aplochiton and the 

 Australian Galaxias, Valasia, Geotria and Caragola. 



The facts that Caragola, Valasia and Geotria regularly live in 

 the sea, that some species of Aplochiton live and spawn in the 

 sea, and that some species of Galaxias spawn in the sea and run up 

 the streams probably account for the presence of most of these in 

 Australia and Chili without requisitioning an antarctic continent con- 

 necting South America and Australia, warm enough to enable these 

 fishes to migrate from one continent to the other by a fresh-water 

 route. 



Summary. 



There is but one genus of fresh-water fishes in Chili that recalls 

 the tropics. It is the genus Cheirodon widely distributed from Pan- 

 ama to Buenos Aires. 



22 La Calera, also including records of Valparaiso. 



23 Including Santiago Market, Penaflor, Llo Lleo, Hospital and El Flor 

 de Maipo. 



2* Including Ensenada, Rio Pescado, Puerto Vafas and Abtao. 

 25 Including Casa Panque, Peulla and Salto de Petrohue. 



