Bulletin A. M, N. H. 



Vol. XXXVI, Plate XXI. 



Rio Negro from Monterbdondo 



Upper limits of arborescent vegetation in the Rio Negro Valley; 



Bogota- Villavlvencio Trail at the right. 



(Tropical Zone; Orinocan Fauna.) 



Junction of Rio Caqueza and Rio Negro 

 A scene near Caqueza. Bogota-Villavicencio Trail leaves the floor of the valley at the right. 

 (Fusion of Temperate, Subtropical, and Tropical Zones.) 



