﻿ElGENMANN I FlSHES OF WESTERN COLOMBIA 



L5 



Leaving out of consideration the high mountain forms, the 

 only species that indicates interchange between the Upper Cauca 

 on the one hand and the Dagua or Patia on the other, is Brycon 

 Kenni, a species not found in the Atrato. It is known to reach 

 an elevation of at least 3,700 feet. 



The Patia does not contain a boca chicas" (=Prochilodus) , 

 "dentones" (=Leporinus) or Plecostomas, all of which are found 

 in the Guayas to the south and in the Atrato to the north. 



The fact that the Upper Cauca has contributed so very little 

 to the Dagua, or the latter so little to the Cauca, when the passes 

 to cross have an elevation of but 6,000 feet, does away with the 

 probability that any of the Magdalena fishes have come across 

 the present high Cordilleras separating the Magdalena basin 

 from the Orinoco. 



