Known from scattered localities in central and eastern Africa, with a relict population in Cameroon. C. s. stuhlmanni known from Ruwenzori Mountains along border of Uganda and DR Congo, southwards to Rutshuru and Rukiga district of Rwanda. C. s. fosteri recorded from Mt. Elgon, Uganda and Cherangani Hills, Kenya. C. s. tropicalis ocurs in the Uluguru mountains and Rungwe district, Tanzania. C. s. balsaci, described by Lamotte and Petter (1981), reported from only Mt. Oku, Cameroon.