Five new troglobitic species of Tyrannochthonius (Arachnida, Pseudoscorpiones, Chthoniidae) from the Yunnan, Guizhou and Sichuan Provinces, China.

Five new species of the genus Tyrannochthonius Chamberlin, 1929 are described from caves in the provinces of Yunnan (T.huilongshanensis sp. nov., T.xinzhaiensis sp. nov., and T.yamuhensis sp. nov.), Guizhou (T.dongjiensis sp. nov.), and Sichuan (T.huaerensis sp. nov.). An identification key is provided for all known representatives of the genus Tyrannochthonius from China.