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30 THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 123, No. 1, March 2011 
females). These are the first records and speci¬ 
mens of the species from the State of Acre. The 
Black Manakin is relatively well-known from the 
central and eastern Amazon Basin, ranging from 
eastern Colombia to the Brazilian State of Para 
(Snow 2004). However, the species is only known 
from a few scattered and isolated localities in 
western Amazonia (Snow 2004, Poletto and 
Aleixo 2005, Schulenberg et al. 2007). Our record 
of Black Manakin expands its Brazilian range and 
reinforces the hypothesis that the species is an 
obligate resident of campinarana habitats in 
western Amazonia (Poletto and Aleixo 2005). 
Yellow-green Vireo (Vireo flavoviridis ). This is 
a Neartic-neotropical migrant rarely observed in 
Brazil (Whitney and Pacheco 2001). All Brazilian 
records of this species with the exception of the 
specimens collected by J. Hidasi on the Rio Javari 
in Amazonas State (Whitney and Pacheco 2001), 
are from Acre (Whittaker and Oren 1999, 
Guilherme 2009). We collected one bird (MPEG 
62172) on 27 January 2007 in secondary forest 
adjacent to the campinarana. This is the first 
specimen of this taxon collected in Acre, and only 
the fourth from Brazil. EG subsequently, on 17 
November 2007, collected another specimen of 
Yellow-green Vireo in varzea forest on the left 
bank of the Rio Envira in central Acre. These 
records indicate the species can be found 
throughout the State of Acre, at least during the 
North temperate winter, between November and 
March. 
Casqued Oropendola (Clypicterus oseryi). This 
species was recorded in Brazil first by Whittaker 
and Oren (1999) in the Junta Basin (Amazonas 
and Acre). There are now a number of records of 
this species from Acre (Guilherme 2009), includ¬ 
ing some from the eastern extreme of the state (A. 
Aleixo and E. Guilherme, unpubl. data). We 
collected two specimens (MPEG 62208, 62209) 
on 30 January 2007 in varzea forest on the left 
bank of the Cruzeiro do Vale stream, adjacent to 
our base camp. 
The campinarana enclave surveyed in the 
present study is relatively small. However, it 
supports habitat specialists which are widely- 
dispersed and patchily distributed in southwestern 
Amazonia. In addition, a number of bird species 
that are poorly-known in Brazil are found in the 
forests adjacent to this enclave. We emphasize the 
need for further studies in this region, including 
not only birds, but also other taxonomic groups, to 
demonstrate the need for establishment of a 
permanently protected area by local authorities 
within the near future. 
ACKNOWLEDGMENTS 
The authors are grateful to Conservation International 
(CI-Belem) for financial support of the expedition to the 
campinaranas of western Acre through the project "Bird 
Fauna of the State of Acre: Composition, Geographic 
Distribution, and Conservation”. We thank Alexandre 
Aleixo, curator of the ornithological collection of the 
Goeldi Museum, for technical and field support and for 
comments on identification of specimens in the laboratory. 
We are also grateful to Sr. Damiao Gonsalves for 
permission to work in the Dois Portos colony, and to Sr. 
Leoncio for field assistance. We thank the renowned 
taxidermist Sr. Manoel Santa Bngida for dedicated and 
skillful preparation of specimens in the field. We also thank 
Alex Jahn and Kevin Zimmer for reviewing the manuscript. 
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