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Range DescriptionSaguinus inustus occurs between the upper Rios Negro and Japurá, west from opposite the Rio Padauarí (64°), a northern tributary of the Rio Negro, into Colombia between the Ríos Apaporis and Guaviare (possibly also occurring in gallery forest of the Río Ariari to the north) to the base of the Serranía La Macarena (Hernández-Camacho and Cooper 1976; Hershkovitz 1977). Its distribution in Colombia is poorly known (Hernández-Camacho and Defler 1989). Hershkovitz (1977) puts the western limit in the region of the upper Ríos Apaporis and Guaviare. Hernández-Camacho and Defler (1989) reported that it is also known from Cano Yaviya, Río Yarí, Caquetá, and although Hernández-Camacho and Cooper (1976) supposed the Apaporis (left bank) to be the southern limit to its range in Colombia, Hernández-Camacho and Defler (1989) were able to report that it occurs as far south as the left bank of the Caquetá (see Palacios et al. 2004). Hershkovitz (1977) places the eastern limit in Colombia along the Ríos Atabapo and Guainia and Trio Negro and certainly Handley (1976; see also Bodini and Pérez-Hernández 1987) gives no hint that it may occur in Venezuela. It has been observed near the mouth of the Rio Japurá, on the left bank at the Lago Amanã (Souza et al. 2004), which extends its distribution further east between these rivers than was indicated by Hershkovitz (1977).