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Range DescriptionSaguinus inustus occurs between the upper Rios Negro and JapurÃ¡, west from opposite the Rio PadauarÃ (64Â°), a northern tributary of the Rio Negro, into Colombia between the RÃos Apaporis and Guaviare (possibly also occurring in gallery forest of the RÃo Ariari to the north) to the base of the SerranÃa La Macarena (HernÃ¡ndez-Camacho and Cooper 1976; Hershkovitz 1977). Its distribution in Colombia is poorly known (HernÃ¡ndez-Camacho and Defler 1989). Hershkovitz (1977) puts the western limit in the region of the upper RÃos Apaporis and Guaviare. HernÃ¡ndez-Camacho and Defler (1989) reported that it is also known from Cano Yaviya, RÃo YarÃ, CaquetÃ¡, and although HernÃ¡ndez-Camacho and Cooper (1976) supposed the Apaporis (left bank) to be the southern limit to its range in Colombia, HernÃ¡ndez-Camacho and Defler (1989) were able to report that it occurs as far south as the left bank of the CaquetÃ¡ (see Palacios et al. 2004). Hershkovitz (1977) places the eastern limit in Colombia along the RÃos Atabapo and Guainia and Trio Negro and certainly Handley (1976; see also Bodini and PÃ©rez-HernÃ¡ndez 1987) gives no hint that it may occur in Venezuela. It has been observed near the mouth of the Rio JapurÃ¡, 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).