iiULLETl.M A. M. N. H. 



Vol. XXXVI, Pi..\TE VI. 



CaUTA Kn'I^li XEAR Bu'iA 



Note the treeless eastern slopes of the Western Andes. A Hock 



of white Herons is feeding on the marsh. 



(Tropical Zone; arid portion of Cauca-^MaKdalena Fauna.) 



FOREWT ON THE CaUCA RiVER AT RiO FhIO 



(Tropical Zone; a humid island in the arid portion of the Cauca-Magdalena Fauna.) 



