Two new cave-adapted pseudoscorpion species belonging to the family Chthoniidae are described: Tyrannochthonius pandussp. nov. from Biyu Cave (Yunnan: Luxi) and Lagynochthonius laoxueyanensissp. nov. from Laoxueyan Cave (Yunnan: Yanshan). Both of them, collected from the dark zone of caves, are highly troglomorphic species.

Eleven new Lagynochthonius species from twelve karst caves of eastern Yunnan are described, including detailed diagnosis and illustrations: L. crassus sp. nov. from Unnamed Cave 1 (Maguan County), L. fengi sp. nov. from Unnamed Cave 2 (Yanjin County), L. magnidentatus sp. nov. from Xiao Cave (Fuyuan County), L. minimus sp. nov. from Yanfen Cave and Cizhu Cave (Xichou County), L. retrorsus sp. nov. from Qinglong Cave (Daguan County), L. serratus sp. nov. from Unnamed Cave 3 (Malipo County), L. spinulentus sp. nov. from Yingshan Cave (Zhenxiong County), L. xiaolinensis sp. nov. from Dayan Cave (Zhenxiong County), L. xibaiensis sp. nov. from Hama Cave (Zhenxiong County), L. xinjiaoensis sp. nov. from Yueliang Cave (Fuyuan County), L. yaowangguensis sp. nov. from Unnamed Cave 4 (Malipo County). An identification key to all known Lagynochthonius species from China is also provided.

Two new troglomorphic pseudoscorpion species, Tyrannochthonius harveyi, sp. nov. and Tyrannochthonius zhai, sp. nov., are described from the dark zone of caves in the tower karst of the Guizhou Province in China. Both species are presently known only from single caves and are likely to have very restricted distribution ranges.

Two new troglomorphic pseudoscorpion species, Parobisium magangensis sp. n. and P. yuantongi sp. n., belonging to the family Neobisiidae, are described based on specimens collected in karst caves from Beijing, China. These are the first troglomorphic pseudoscorpions discovered from caves in northern China. Detailed diagnosis, descriptions, and illustrations are provided. We also offer future research and management recommendations for these two new pseudoscorpion species.

The males of Euophrys atrata Song & Chai,1992 and Euophrys bulbus Bao & Peng, 2002 are described and illustrated for the first time from southern China.