Four new species of cave-adapted pseudoscorpions (Pseudoscorpiones, Pseudotyrannochthoniidae) from Guizhou, China.

Four new troglomorphic pseudotyrannochthoniid pseudoscorpion species collected from karst caves in Guizhou Province are described with detailed diagnoses and illustrations: Allochthoniusbainiensis sp. nov. from Liangfeng Cave (Xishui County), Allochthoniuspandus sp. nov. from Daozuo Cave (Xishui County), Allochthoniusxinqiaoensis sp. nov. from Sanjie Cave (Fenggang County), and Spelaeochthoniuswulibeiensis sp. nov. from Wulibei Cave (Weining County). Spelaeochthoniuswulibeiensis sp. nov. represents the first record of the genus in China. The diagnostic features of these four new cave-adapted (troglomorphic) species are presented and discussed, as well as compared with closely related species. The data on their distribution, habitat and ecology of the species are also given.