Abstract
New information is presented concerning the systematics and biogeography of the islands of the Pacific coast of western Panama. Sporophila angolensis fractor, new subspecies, characterized by a larger bill than S. a. ochrogyne, is described from Isla de Coiba, Panama. Recent doubt cast on the validity of the Coiba endemic subspecies Polioptila plumbea cinericia is unfounded. The first specimen records are given for Islas Secas and Isla Jicarón, including a specimen of Contopus cinereus from the latter that is referable to the Coiba subspecies C. c. aithalodes. Tyrannus melancholicus and Elaenia flavogaster are added to the avifauna of Isla Brincanco.
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