| Mites of the genus Rhizoglyphus (Acari: Acaridae) are associated with the underground storage organs such as bulbs and corms. They are pests living in stores and trading products which are hard to control. In this thesis the taxonomic history, morphology, biology and economical significance of the genus are comprehensively reviewed and the study techniques and methods are provided.Four hundred and fifty samples were collected from the following 8 provinces or municipalities: Fujian, Beijing, Shanxi, Hebei, Yunnan, Jiangshu, Guizhou and Hainan. Among these samples 109 (24 percent) were found with rhizoglyphid mites. Mites were mounted on about 3500 slides. A total of 8 rhizoglyphid mite species including a new species and 3 firstly recorded species are described and illustrated. They are R. allii Bu et Wang, 1995, R. brevisetosus sp. nov., R. echinopus (Fumouze & Robin, 1868), R narcissi Lin & Ding, 1990, R. ogdeni Fan & Zhang, 2004, R. robini Claparede, 1869, R. setosus Manson, 1972 and R. singularis Manson, 1972. Taxonomic references, hosts and distribution data of each species are given. An identification key to adult males and females from China is provided.Qualitative analysis method was employed to evaluate the risks of the mites of the genus. Four species, R. caladii, R. minutus, R. setosus and R. singularis, were classified as quarantine pests (QP), and R. echinopus and R. robini, were considered as regulated non-quarantine pests (RNQP).In addition to the main text part a dat abase including species name, synonymy, habitat, hosts and geographical distribution are supplied in the appendix. A key to stages of the genus and a catalogue to the main morphological characters are also provided.
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