From 14 June to 5 July 1979 we studied the avifauna at two localities in Depto. Tumbes, Peru, near the Ecuadorean border. We obtained specimens of six species and 1 5 subspecies new for Peru, and collected specimens and natural history information on such poorly known taxa as Ortalis erythroptera, Synallaxis tithys, Automolus erythrocephalus, and Thamnophilus zarumae. RESUMEN. Entre el 14 de junio y el 5 de julio de 1979 estudiamos la avifauna de dos localidades cercanas a la frontera con Ecuador en el Departamento de Tumbes, Peru. Obtuvimos especimenes de seis especies y 1 5 subespecies nuevas para el Peru y coleccionamos especimenes e information sobre la historia natural de taxa poco conocida como: Ortalis erythroptera, Synallaxis tithys, Automolus erythrocephalus y Thamnophilus zarumae. In South America west of the Andes, the ranges of many humid tropical forest bird species extend from Colombia south to western Ecuador. The climate of this narrow, coastal corridor becomes much drier in southwestern Ecuador, and many species found in the more humid forests to the north are absent. The dry area extends from northwestern Peru in the Deptos. of Piura and Tumbes into west-central Ecuador, with a narrow arm extending into coastal northwestern Ecuador, and is bounded on the east by the Andean Cordillera. Noting the high endemism of birds, as well as other organisms, in the region, Chapman (1926) designated them as the Equatorial Arid Fauna. This region has been studied very little by ornithologists in recent years. Jelski and Stolzmann visited Tumbes in 1876, going on to collect at Lechugal, and in nearby Ecuador at Palmar (= Palmales; Taczanowski 1877). Collecting in the region was not extensive, however, until just after the turn of the century when several expeditions from the American Museum of Natural History worked in the area of Ecuador just north and east of what is now the Depto. Tumbes, Peru. Collectors from the American Museum spent about 200 field-days in the area between 1913 and 1922 (Chapman 1926). M. A. Carriker, Jr., later collected at La Laja, Peru, now near the Ecuadorean border (Bond 1945). From 14 June to 5 July 1979 a field party (the authors, J. W. Eley, and Manuel Sanchez S.) from the Louisiana State University Museum of Zoology (LSUMZ) studied the birds of northeastern Depto. Tumbes near the Ecuadorean border. The aim of our collecting was to clarify the ranges of the forms that reach their southern limit in this region, which is believed to be at or near the southern terminus of Chapman's Colombian-Pacific Fauna, to gather information on the poorly known species of the area, and to provide the Peruvian government with an initial faunal inventory of the Bosque Nacional de Tumbes. Our camp was ca. 2 km east of the Peruvian military post at El Caucho, on Quebrada Faical, about 24 km southeast of Pampa de Hospital (3°49'S, 80°l 7'W; Fig. 1), at about 400 m elevation. During this period, we also visited Campo Verde (3°51'S, 80°H'W), another military outpost ca. 11 km eastsoutheast of El Caucho and at 750 m elevation (30 June; 1, 3, and 4 July). At these localities we collected six bird species not previously recorded in Peru, and recorded 1 5 subspecies new for the country. Because of the extensive earlier collections in nearby Ecuador, most species that we recorded new for Peru had previously been taken within 100 km of our El Caucho camp. Thus, most records are not major range extensions, and in most cases extend the range westward, not
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