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Notes: The paper presents one new species of the genus Coccidencyrtus Ashmead, i.e. Coccidencyrtus longiclavatus Xu sp. nov. collected from Shangdong, Jiangsu, Zhejiang, Fujian in China. A key for three species of Coccidencyrtus Ashmead from China is given. One new species of the genus Mayrencyrtus Hincks is presented in this paper, i.e. Mayrencyrtus longiscapus Xu sp. nov. collected from Shanxi, Shaanxi in China. All specimens are deposited in the Institute of Applied Entomology, College of Agriculture & Biotechnology, Zhejiang University. Coccidencyrtus longiclavatus Xu, sp. nov. Host: Quadraspidiotus pernisiosus on pear tree, Lopholeucaspis japonica on Citrus, Diaspids on walnut tree. Distribution: Shangdong (Tai'an) , Jiangsu (Donghai), Zhejiang (Linhai), Fujian (Jianning). This species is similar to Coccidencyrtus exiguous Noyes et Ren, and Coccidencyrtus mandibularis Hayat, Alam et Agarwal 1975, but can be distinguished from the latter by 1) antennal scape 4.6 times as long as wide, 2) the first-fifth funicle segments subquadrate, 3) clava as long as funicle and half pedicel combined, with truncated apex. Mayrencyrtus longiscapus Xu sp. nov. Host: Eulecanium gigantea, Drosicha contrahens. Distribution: Shanxi (Taiyuan), Shaanxi (Yangling). This species is similar to Mayrencyrtus japonicus Tachikawa.