84 



Annals of the Carnegie Museum. 



*fPyrrhomyias vicillotioidcs assi- 



milis 

 *Elcenia pudica pudica 



Tyranniscus nigrocapillns flavi- 

 mcntum 



Tyranniscus improbus 



Scrpophaga cinerca cana 



Euscarthmus granadcnsis 

 ■\Octhccca diadcma jcsupi 

 *Turdus olivater sanctcc-martce 



Catharus fuscatcr sanctcr-martcc 

 *Henicorhina hilaris bangsi 



Cistothorus alticola 



Vireosylva Josephs mirandce 

 fPygochelidon cyanoleuca 

 *Basileuterus conspic Hiatus 

 j-Myioborus flavivcrtcx 



Myioborus vcrticalis 

 Diglossa albilatcralis 

 Diglossa sittoides similis 

 Sporathraupis cyanoccphala 



margarita 

 Tangara heinei 

 *Tangara cyanoptcra 

 fPa?cilotliraupis melanogenys 

 Chlorophonia frontalis psit- 



tacina 

 Phcucticus laubmanni 

 Sporophila luctuosa 

 Buarremon basilicus 

 Atlapetcs melanoccphalus 

 Catamblyrhynchus diadcma 



diadcma 



Faunal Affinities. — The first thing that strikes one after an examina- 

 tion of this list is the comparatively small number of species repre- 

 sented — only seventy-five in all. In order to test the truth of this 

 impression we have gone to considerable pains to compile a list of the 

 Subtropical Zone forms of the Eastern Andes of Colombia, based 

 mainly on the data given by Dr. Chapman in his recent paper, with 

 corrections and additions from the (unpublished) work of the junior 

 author. We find that the list totals one hundred and ninety-five forms, 

 or considerably more than twice as many as have been found in the 

 Santa Marta region. Again, we find that the number of Subtropical 

 forms is not only actually, but also relatively smaller in the Santa 

 Marta region than in the Andes of Colombia. It appears that in the 

 latter section, considered as a whole, these constitute 25 per cent of 

 the total resident avifauna, and are 40 per cent less numerous than the 

 Tropical forms, while in the Santa Marta region they are only 17 per 

 cent of the total resident avifauna, and 22 per cent as numerous as the 

 Tropical forms. In other words, if the Santa Marta region had as 

 many Subtropical forms in proportion to Tropical as the Colombian 

 Andes, it would possess one hundred and thirty-five instead of only 

 seventy-five forms. These facts in themselves signify the semi-insular 



