The distribution of the family is unusual. One species, C. maculatus, occurs in the lowlands of Sri Lanka. With the exception of C. ruffus, all of the other species occur on Indonesian islands and Borneo (shared by Indonesia and Malaysia). The rest of the range of the family is accounted for by C. ruffus, which is found from Myanmar east through southern China (including Hainan Island), Thailand, Laos, Cambodia, Vietnam, and south through the Malaysian peninsula, Sumatra, Borneo, Java, Sulawesi, Sula, and Buton. The most easterly distributed species is C. aruensis from Aru Island, south of Irian Jaya.
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