150 BuUetin American Museum of Natural History. [Vol. XXXVI, 



As stated in outlining the boundaries of the West Andean Fauna, the 

 subtropical portion of the Central Andes, as a whole, is more closely related 

 to that of the Eastern, than to. that of the Western Andes, but the West 

 Andean element on its western slopes is sufSciently strong to make it seem 

 desirable to place that slope in the West Andean Fauna, while the eastern 

 slope may unquestionably be placed in the East Andean Fauna. 



In the latitude of Bogota, the Eastern Andes have a width of about one 

 hundred miles, and it is not improbable that the subtropical eastern slopes 

 may have forms either not found on the western slopes or representative of 

 them. Ostinops alfredi neglectus and 0. a. sincipitalis, and Xanthoura 

 yncas cyanddorsalis and X. y. galeatus, are evidently representative races of 

 this kind, the first named of each species being found on the eastern, the 

 second, on the western subtropical slope of the range. 



As stated in the itinerary of our expedition (No. 7) to the Bogota region, 

 our route on the eastern slope of the range between Bogota and Villavicencio 

 did not take us into the humid subtropics and we are not therefore in a 

 position to compare the subtropical life of both sides of the range. 



The East Andean Fauna of Colombia has but few species which are 

 restricted to it; its practical physical identity with those portions of the 

 Subtropical Zone to the north and south prevent that isolation which 

 renders cumulative the effects of environment on an organism. While 

 none of the species in the appended list are found in the Western Andes, 

 most of them range beyond the Colombian portion of the Subtropical Zone. 



List of Species and Subspecies which Characterize the East Andean Subtropical Fauna. 



Nothooercus bonapartei ' Vestipedes aureliae aureliaj 



Penelope cristata ^ Adelomyia melanogenys melanogenys 



Odontophorus strophium Cyanolesbia kingi kingi 



Geotrygon linearis linearis ' " mocoa mocoa 



Ognorhynohus icterotis '' Schistes geoffroyi 



Pyrrhura calHptera Eubucco richardsoni granadensis 



" souanoei ' " bourcieri bourcieri '■ 



Hapalopsittaca amazonina Ramphastos ambiguus ambiguus ^ 



LuiocaHs rufiventris Andigena nigrirostris nigrirostris 

 PhcEthornis syrmatophorus columbianus Aulacorhynchus albivitta albivitta ' 



Phaiolaima rubinoides rubinoides Chloronerpes rubiginosus buenavistse 



Heliodoxa leadbeateri Veniliornis oleaginus f umigatus 



Helianthea cceligena columbiana Terenura caUinota 



Lafresnayea lafresnayi Pyriglena picea ^ 



1 Found also on the eastern slopes of the Central Andes. 



2 Found also on both slopes of the Central Andes, 



