A review of the spider genus Sinoalaria (Araneae, Theridiosomatidae), with the descriptions of four new species and two new combinations.

The spider genus Sinoalaria Zhao & Li, 2014 is redefined and reviewed. A total of ten species are studied, including four new species: S.chi Yu & Lin, sp. nov. (♂♀), S.shenhei Yu & Lin, sp. nov. (♀), S.shuidi Yu & Lin, sp. nov. (♀), S.xiaotu Yu & Lin, sp. nov. (♂♀). Two new combinations are proposed: Sinoalarianitida (Zhao & Li, 2012), comb. nov. and S.prolata (Zhao & Li, 2012), comb. nov. , both transferred from Karstia Chen, 2010. The material of six known species were re-examined and photographed, including the type species, S.chengguanensis (Zhao & Li, 2012). A key is provided for all species of the genus, as well as diagnoses, illustrations, and a distribution map.