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



So far as I am aware, no attempt to map the faunal areas of Amazonia 

 has as yet been made, but it is evident that in spite of its enormous extent 

 the comparatively uniform climatic and topographic conditions which 

 prevail throughout its forested portions have produced correspondingly 

 uniform faunal characteristics. 



Such small, sedentary species as, for example, Dichrozona and Rhopoterpe 

 xange, unchanged from the base of the Andes through two thousand miles 

 •of forest to the lower Amazon, and the local differences in flora occasioned 

 by the wide variations between low and high water on the larger streams 

 are often more pronounced than those existing in districts at opposite 

 borders of the region. 



The distinctive feature of Amazonia is its forests, so well described by 

 Wallace, Bates, Spruce and others. As elsewhere remarked, the northern 

 limit of this Amazonian forest coincides approximately with the Guaviare 

 River, beyond which lie the Llanos, but a heavily forested belt extends 

 much farther north along the lower slopes of the Andes. According to Rice, 

 as already quoted, the Sierra Chiribiquete lying south of the Guaviare, 

 reaches an altitude of 2850 feet. -Judging by our work at Buena Vista 

 (alt. 4500 ft.), on the outermost spur of the Eastern Andes above Villa- 

 vicencio, this is not sufficient altitude to produce a marked change in fauna. 

 It remains, however, to be discovered td what extent the apparent isolation 

 of these mountains and the possibly different environmental conditions 

 they may offer, has modified the forms inhabiting them. 



As might be expected, there is a close resemblance between the bird-life 

 of Amazonian Colombia, as it is revealed by Miller's work at La Morelia 

 and Florencia, and that of eastern Ecuador as that has been made known by 

 the so-called 'Napo' specimens. 



It goes without saying that notwithstanding the large collections secured 

 by him in a limited time, Miller's month at La Morelia and Florencia 

 enabled him to get only enough material to show the faunal features of the 

 region, and their Amazonian character is indicated by the appended list of, 

 distributionally, the more significant species. 



List of the More Characteristic Amazonian Species collected at Florencia and La Morelia, 

 in Southeastern Colombia. 



Penelope jaoqtiaQU Creciscus aenops 



Ortalis guttata Psophia napensis 



Pipile cumanensis Otus watsoni 



Opisthocomus hoazin Psittaoula sclateri 



Anurolimnas castaneiceps Electron platyrhjmchus pjTrholaemus 



" hauxwelli Hydropsalis climacocerca 



