Abstract
Abstract Berlioz (1959) described Serpophaga griseiceps on the basis of four specimens from Cochabamba, Bolivia, housed at the Museum National d'Histoire Naturelle (Paris, France). Traylor (1979) subsumed the taxon, without justification, in S. munda after examining other specimens from Cochabamba at the Field Museum of Natural History (FMNH; Chicago, Illinois). Remsen and Traylor (1989) added that S. griseiceps represents the juvenal plumage of S. munda. Straneck (1993) presented new data from central Argentina to revalidate S. griseiceps, and although that account has methodological problems, numerous authors have endorsed its taxonomic conclusions. We re-evaluated the validity of S. griseiceps by examining the type series and specimens deposited at the Museo Argentino de Ciencias Naturales (Buenos Aires, Argentina) and our own field data from Cochabamba, and by critiquing Straneck's taxonomic conclusions. The type specimens of S. griseiceps clearly resemble juvenile S. munda. Photographs of those speci...
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