standpoint in the heavy forest on the summit of the Coast Kango of the Andes cliosen 

 for reproduction in a Museum habitat group. The moss-covered tree trunks indicate tlie 

 extreme humiditv of the locality 



Magdalciiii, wliicli ;it the hciidwatcrs of iia\i,uat ion, sonic tlioii-aiul miles 

 from the sea, lias an aititiKle of only a few Innidi-cd fi'cl. 



In adtlition to the climatic zones 1\ in.u' hctwccn sea le\cl i.'iid snowline, 

 the fainial conditions of this rc<;ion are fufther di\-crsi(ied liy rrinfall. The 

 western slope of the ("oast Range differs widely from the conditions pre\ail- 

 ing on most of the Pacific coast of South America, in heing exceedinglx' 

 humid. , The annual rainfall at the poi't of linena\ cntin-a is said to e.xeeed 

 four humh-ed inches.' The western .slope of the Coast Range therefore, 

 from sea level to the summit of the ninge is densely forested. The eastern 

 slope of this range however, lacking the he;i\y ])recipitalion which occurs 

 on the western slope, is comparatively arid and eonsetiuently treeless. 

 The Cauca \'alley itself receives, for the tropics, only a limited amount of 

 rain, sufficient however for agrictdtural purposes; while the foothills ot the 



296 



