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Range DescriptionSaguinus imperator subgrisescens Bolivia, Brazil, Peru
Southwestern Amazon, in Brazil along the east (right bank) of the upper Rio JuruÃ¡ east to the Rios TarauacÃ¡ and JuruparÃ, to the Brazil/Peruvian frontier. Into Peru, west from the JuruÃ¡ headwaters, it occurs as far as the foothills of the Andes in the upper RÃo Ucayali, east of the mouth of the RÃo Apurimac and to the south of the RÃos Urubamba and Inuya. Its range extends east into Bolivia on both sides of the RÃo Madre de Dios (Izawa, 1979). It is probably limited to the south of the RÃo TahuamanÃº. Izawa and Bejarano (1981) reported it only from the RÃo Muyumanu basin, a south bank tributary of the RÃo TahuamanÃº. Castro et al. (1990) found that it was absent from the area between IÃ±apari (just south of the RÃo Acre) and Iberia (north bank of the RÃo TahuamanÃº) in Peru where S. l. labiatus occurs. Aquino and EncarnaciÃ³n (1994) extended the range indicated by Hershkovitz (1979) east to the basin of the RÃo Tambopata to the Bolivian border, indicating that the RÃo Madidi, an eastern tributary of the RÃo Beni in Bolivia, may mark the southern limit to this species.