This species is known from Zanzibar Island, Tanzania (the nominate subspecies), with the form udzungwensis recorded from the lowland Udzungwa Mountains, the Uluguru Mountains and the Usambara Mountains, all in Tanzania. Recorded from sea level to 1100 m asl (Butynski et al. 2006). It has also recently been recorded from Mafia Island (A. Perkin pers. comm. 2008).