Todd-Carriker : Birds of Santa Marta Region, Colombia. 57 



Geothlypis trichas trichas 

 Seiurus novehoracensis nove- 



boracensis 

 Seiurus novehoracensis nota- 



bilis 

 Seiurus motacilla 

 Seiurus aurocapillus auroca- 



pillus 

 Oporornis Philadelphia 

 Oporornis agilis 

 Oporornis formosus 

 Dendroica striata 

 Dendroica castanea 

 Dendroica fusca 

 Dendroica virens virens 



Dendroica ccerulescens cceru- 



lescens 

 Dendroica cestiva astiva 

 Vermivora peregrina 

 Vermivora pinus 

 Vermiz'ora chrysoptera 

 Protonotaria citrea 

 Mniotilta varia 

 Dolichonyx orysivorus 

 Icterus galbula 

 Icterus spurius 

 Piranga rubra rubra 

 Hedymeles ludovicianus 

 Spiza americana 



Life-Zones of the Santa Marta Region. 

 While it has long been known in a general way that the bird-life of 

 the median and higher elevations of the mountains in tropical America' 

 differed materially frpm that of the lower levels, and while many of 

 these alticoline forms have been known to science for a considerable 

 period, it would seem that practically no serious effort was ever made 

 to study them from the distributional standpoint (on any extensive 

 scale at least), or to correlate and systematize such faunal data as 

 were already available, prior to the appearance of Dr. Chapman's recent 

 epoch-making work on the distribution- of bird-life in Colombia. The 

 discovery that the life of the Neotropical Region, taken as a whole, 

 falls into four primary divisions, or natural life-zones, each char- 

 acterized by its own assemblage of forms, marks the initial step in the 

 development of the subject. The second step is properly the deter- 

 mination of the minor faunal areas of each zone, involving a study 

 of their respective characters, limitations, and relationships. * We ac- 

 cept the general conclusions reached by Dr. Chapman with reference 

 to the faunal divisions to be recognized in Colombia, as well as with 

 regard to the nomenclature to be employed. The same life-zones occur 

 in the Santa Marta region as in the Andes, but owing to the differences 

 in humidity and temperature existing . on the several slopes of the 

 Sierra Nevada and its encircling lowlands it is a more difficult matter 



