Synallaxis cherriei

Abstract: We report range extensions of Caprimulgus sericocaudatus, Automolus ochrolaemus, Dichro- zona cincta, Poecilotriccus andrei, Ramphotrigon fuscicauda, Ramphotrigon megacephala, Turdus lawrencii, and Euphonia chrysopasta for Pinkaiti and Gorotire, east of the Xingu River, southeastern ParaState, Brazil. The distributional status of the following species in southeastern Amazonia is also discussed: Nonnula ruficapilla, Synallaxis cherriei, and Simoxenops ucayalae. The new records we report suggest that the patchy distribution of some birds in eastern Amazonia, such as species associated with bamboo, can be explained by a complex mosaic of habitats at the eastern and southern fringes of the Amazonian basin. The range extensions we report demonstrate that areas inventoried a long time ago, before an emphasis on vocal identification of species, and assumed to be ''well known'', can in fact turn out to be ornithologically undersampled. Received 5 April 1999, accepted 30 Oct. 1999. RESUMO.—Registramos extensoes de distribuicao para o sudeste da Amazonia, localidades de Pinkaiti e Gorotire, oeste do rio Xingu, estado do Para ´, para as seguintes especies:Caprimulgus sericocaudatus, Automolus ochrolaemus, Dichrozona cincta, Poecilotriccus andrei, Ramphotrigon fuscicauda, Ramphotrigon megacephala, Turdus lawrencii e Euphonia chrysopasta. Tambem discutimos registros para o sudeste da Amazonia das se- guintes especies:Nonnula ruficapilla, Synallaxis cherriei, e Simoxenops ucayalae.A distribuicao de habitats na forma de mosaicos no leste e sul da Amazonia pode explicar a distribuicao localizada de algumas especies de aves na regiao, como especies associadas a ` manchas de taboca. Nossas extensoes de distribuicao demonstram que areas na Amazonia exploradas hamuito tempo, antes do estudo e documentacao acustica da avifauna, e consideradas bem conhecidas ornitologicamente, sao na realidade ainda sub-amostradas.