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Bulletin American Museum of Natural History. [Vol. XXXVI, 



lena Valley from its head northward to the upper limits of heavy forest 

 growth near La Dorada. The latter includes the lower Cauca-Magdalena 

 forests which cover the bottomlands and lower slopes of the mountains 

 from La Dorada northward to the vicinity of Banco. To the northeast the 

 country bordering the Rio Cesar is of the open, savanna type, and belongs 

 to the Caribbean Fauna, but it is possible that a belt of Tropical Zone 



lOf 



10 



go- 



Fig. 9. Known distribution of Micromonacba lanceolata^ a species of the Tropical Zone which 

 is found at both the eastern and western bases of the Andes. 



forest skirts the Eastern Andes and crosses its northern end to connect 

 with the forests of the southern Maracaibo district.'^ This connection, 

 however, is not known by me to exist. In any event, it is not probable 

 that the association of species forming the Cauca-Magdalena Fauna extends 

 far into the Cesar Valley. 



To the west, the Cauca-Magdalena Fauna reaches at least to the Tuyra 



1 Compare Simons*s map of the Goajira Peninsula (Proc. R. G. S., 1885) where a considerable 

 area at the northeastern end of the Eastern Andes beats the name "Mantes de Oca (woods)." 



