Callicebus (Callicebus) dubius Hershkovitz 1988 , Fieldiana Zool., n. s., 55: 66 Order Primates Wilson, Don E. Reeder, DeeAnn PMLC 1290433 Hershkovitz 1988 Hershkovitz 1988 Mammalia Pitheciidae Callicebus Animalia Primates 143 Chordata species dubius Callicebus     Callicebus (Callicebus) dubiusHershkovitz 1988, Fieldiana Zool., n. s., 55: 66.   Type Locality:  Brazil, east bank of R. Purus, opposite Lago Ayapua, ca. 4°20' S, 62°00' W, according to Hershkovitz (1990).   Vernacular Names: Hershkovitz' Titi.   Distribution: Brazil, Ituxi River or the Mucuim River, east to the Madeira River south of Humaita, and west to the Purus River ( van Roosmalen et al., 2002).   Conservation: CITES– Appendix II; IUCN– Vulnerable.   Discussion:Subgenus  Callicebus.  C. cupreusspecies group. A synonym of  cupreusaccording to Groves (2001 c), who thought it was a colour morph, but shown to be consistently different, with a distinct geographic distribution by van Roosmalen et al. (2002). 4867331324 Brazil -4.3333335 -62.0 143