Abstract
Abstract We describe Phyllomyias weedeni, a new species of tyrannulet (Tyrannidae) from the Bolivian and Peruvian Andes. The species is morphologically and vocally most similar to widely allopatric P. fasciatus (Planalto Tyrannulet), but vocalizations recorded at the six localities from which it is known differ conspicuously and significantly from those of P. fasciatus, and differences in plumage and measurements are also apparent. Vocalization analysis further suggests that the P. fasciatus complex, which comprises three named subspecies, may consist of more than one biological species. Phyllomyias weedeni inhabits the upper canopy of humid and semi-humid foothill and lower montane forest within a narrow elevational range (700–1,200 m). It appears to prefer irregularly structured canopy dominated by small-leaved trees but has also been found in a mosaic of shade-coffee (Coffea spp.) plantations and remnant forest patches. It occurs at low densities, is apparently patchily distributed, and has an estimate...
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