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Ten new species of the spider family Psilodercidae Machado, 1951 are described from tropical East Asia, including five species found in China: Sinoderces luohanensis Li & Li, sp. nov. (♂♀), S. xueae Li & Li, sp. nov. (♂♀), S. taichi Li & Li, sp. nov. (♂♀), S. wenshanensis Li & Li, sp. nov. (♂♀), S. aiensis Li & Li, sp. nov. (♂♀); three are from Laos: S. khanensis Li & Li, sp. nov. (♂♀), S. phathaoensis Li & Li, sp. nov. (♂♀), S. kieoensis Li & Li, sp. nov. (♂); and the rest are from Thailand: S. saraburiensis Li & Li, sp. nov. (♂), S. dewaroopensis Li & Li, sp. nov. (♂♀). Types of all new species are deposited in the Institute of Zoology, Chinese Academy of Sciences in Beijing, China.

Four new species are described in two psilodercid genera, Qiongocera Li & Li, 2017 and Relictocera Li & Li, 2017: Qiongocera luoxuan Li & Li, sp. nov. (♂♀) from China, Relictocera wugen Li & Li, sp. nov. (♂♀) and R. sigen Li & Li, sp. nov. (♂) from Vietnam, and R. qianzi Li & Li, sp. nov. (♂♀) from Thailand. These genera were previously thought to be monotypic. In addition, one species of the genus Merizocera Fage, 1912 is transferred to Relictocera: Relictocera mus (Deeleman-Reinhold, 1995), comb. nov. (♂♀). The types of the new species are deposited in the Institute of Zoology, Chinese Academy of Sciences (IZCAS) in Beijing.

Three new species of the genus Flexicrurum Tong & Li, 2007, from Hainan Island, China are described: F. wuzhishanense sp. nov. (♂♀), F. yangjiao sp. nov. (♂♀), and F. qishi sp. nov. (♂♀). A key to males of species of Flexicrurum is provided. Additionally, the female of F. minutum Tong & Li, 2007, is described for the first time. To date, the genus is endemic to Hainan Island, China. Types are deposited in the Institute of Zoology, Chinese Academy of Sciences (IZCAS) in Beijing.

Three new species of Luzonacera Li & Li, 2017 are described: L. francescoballarini Li & Li, sp. n. (♂♀), L. lattuensis Li & Li, sp. n. (♂♀) and L. peterjaegeri Li & Li, sp. n. (♂♀). Prior to this study, the genus was known by two species, both from Luzon Island, Philippines. So far, the genus and all five species are endemic to Luzon Island and can be found in dry or humid caves in a dark environment.

Spiders of the genus Althepus Thorell, 1898 are found throughout Southeast Asia, notable for their long walking legs. Ten new species are reported in this paper from China, Indonesia, Laos and Myanmar: A. chengmenensis Li & Li, sp. n. (♂♀), A. cheni Li & Li, sp. n. (♂♀), A. gouci Li & Li, sp. n. (♂♀), A. hongguangi Li & Li, sp. n. (♂♀), A. phousalao Li & Li, sp. n. (♂♀), A. qianhuang Li & Li, sp. n. (♂♀), A. qingyuani Li & Li, sp. n. (♀), A. sepakuensis Li & Li, sp. n. (♂♀), A. xuae Li & Li, sp. n. (♂♀) and A. yizhuang Li & Li, sp. n. (♂♀). These species were found in cave entrances and among tree-buttresses, indicating the spiders have a preference for dark and moist environments. All types are deposited in the Institute of Zoology, Chinese Academy of Sciences in Beijing, China (IZCAS).