CONTRIBUTIONS TO AVIAN BIOGEOGRAPHY FROM THE ARCHIPELAGO AND LOWLANDSOF BOCAS-DEL-TORO, PANAMA

New distributional information is summarized from avifaunal surveys co nducted from 1987 to 1991 in the ornithologically unknown islands of t he province of Bocas del Toro, Panama, and points on the adjacent main land. These establish the region of the Laguna de Chiriqui to be of gr eat biogeographic interest and complexity. New records include 3 speci es new to Panama, and 11 species and 3 subspecies new to Bocas del Tor o. Two taxa of birds (Platyrinchus cancrominus and a form of Chloropha nes spiza) are relicts on islands and are not resident on the Panamani an mainland. Four pairs of species or subspecies (Anthracothorax prevo stii/A. veraguensis, Glaucis aenea/G. hirsuta, Gymnopithys bicolor oli vascens/G. b. bicolor, and Tangara inornata rava/T. i. languens) are s hown for the first time to change abruptly over a narrow distance alon g the southern shore of the Laguna de Chiriqui.