1917.] 



Chapman, Distribution of Birdr-Ufe in Colombia. 



121 



The humid portion of the Cauca-Magdalena Fauna Ues chiefly in the 

 Department of Antioquia. It is largely covered with heavy, primeval 

 forest, and is connected with the forests of the Colombian-Pacific Fauna 

 by the forested area at the northern end of the Western Andes. This 

 continuous forest growth has made the lower Cauca-Magdalena district 

 easy of access to Pacific coast forms, which have entered it in such large 



Fig. 12. Known range of Myrmeciza exsul. A species which enters the Cauca-Magdalena 

 Fauna from the west. 



numbers that it might well be considered a part of the Colombian-Pacific 

 Fauna, had not invasion from the east given the Amazonian region even 

 greater claims upon it. 



When, however, one compares the narrow strip of country lying to the 

 west with the vast area lying to the east, the proportion of western to east- 



