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Range DescriptionCallicebus cupreus occurs south of the RÃo MaraÃ±on/Rio SolimÃµes, as far as the east bank of the RÃo Ucayali, in Loreto and northern Ucayali, Peru. To the south it ranges into Acre as far as the headwaters of the Rios JuruÃ¡ and PurÃºs in Brazil, and north-east as far as the lower and middle Rio JuruÃ¡ and extending into the Rios JuruÃ¡/PurÃºs interfluve south and maybe also north of the RioTapauÃ¡, a left bank tributary of the Rio PurÃºs. East it ranges as far as the left bank of the Rio PurÃºs (Hershkovitz 1990; Van Roosmalen et al. 2002). van Roosmalen and colleagues (2002) suggest that C. cupreus and C. moloch groups are ecologically similar and therefore allopatric, but members of these groups are sympatric with species from the torquatus group.