EIGENMANN: fish fauna of BOGOTA 461 



It belongs to the eastern slopes of the Andes from the Rio Beni 

 to Central Colombia at least. San Gil at 3628 feet in the Mag- 

 dalena basin is its only record west of the Cordilleras. No low- 

 land genera or species are found on the heights. So many of 

 the lowland genera and species of the Magdalena to the west of 

 it are identical with those of the Orinoco to the east of it, that 

 it seems very probable that the formation of these young Cordil- 

 leras has cut a former continuous fauna in two. Is it possible 

 that the presence of Creagrutus beni at San Gil indicates a late 

 route of migration? 



Our knowledge of the fauna of the Cordillera de Bogota is 

 based on : 



1. The observations of Humboldt during a stay at Bogota. 



2. Collections received by the British Museum from different 

 collectors. 



3. Collections made by Mr. Manuel Gonzales, my servant 

 during my ichthyological reconnaissance of Colombia in 191 2. 

 He collected for me in the Cordillera de Bogota within a 

 radius of a few days riding from Bogota. He gathered 

 specimens in the quebradas along the route from Facatativa 

 on the Plain of Bogota northwestward to Honda on the 

 Magdalena, the western base of the Cordillera. Also along 

 the route northward from Bogota, from Suescum north through 

 Susa, Chiquinquira, Quebrada, Ropero, Guadalupe, Mogotes, 

 San Gil, and Capitanejo in the territory embraced by the Rio 

 Sagomoso and the Rio Suarez and finally southeastward from 

 Bogota along the route from Bogota to Villavicencio.- 



4. Very valuable collections made for Hermano Apolinar 

 Maria, Director of the Museum of the Instituto de la Salle, 

 on the Plains of Bogota and at the eastern base of the Cordillera 

 of Bogota, at Cumaral and Carneceria. I have received a series 

 of these fishes. Most of the species at Villavicencio, Cumaral and 

 Carneceria more properly belong to the fauna of the Llanos of 

 Colombia and Venezuela than to that of the Cordilleras. 



5. Extensive collections were made by myself near Bogota. 



* Mr. Gonzales also collected at Barrigon on the Meta but this locality is beyond 

 the mountains. Other collections made by Gonzales were unfortunately lost by 

 the carriers after reaching New York. 



