One new genus, ten new species, and four new records of eriophyoid mites from Tibet are described and illustrated. They are Eriophyes clematus sp. nov. on Clematis buchananiana DC. (Ranunculaceae), Eriophyes niveus sp. nov. on Rubus niveus Thunb. (Rosaceae), Plancorpus populi gen. nov. & sp. nov. on Populus simonii Carrière (Salicaceae), Aculochetus desmodius sp. nov. on Desmodium elegans DC. (Leguminosae), Aculus trilobus sp. nov. on Prunus triloba Lindl. (Rosaceae), Tetra hyperica sp. nov. on Hypericum bellum Li (Hypericaceae), Calepitrimerus buchananianus sp. nov. on Clematis buchananiana DC. (Ranunculaceae), Calepitrimerus tanguticus sp. nov. on Clematis tangutica (Maxim.) Korsh. (Ranunculaceae), Phyllocoptes excoecarus sp. nov. on Excoecaria acerifolia Didr. (Euphorbiaceae), Neorhynacus pistacus sp. nov. on Pistacia weinmanniifolia J. Poiss. ex Franch. (Anacardiaceae), Anthocoptes punctidorsa Keifer, 1943 rec. nov. on Ulmus pumila L. (Ulmaceae), Vittacus bougainvilleae (Keifer, 1959) rec. nov. on Bougainvillea spectabilis Willd. (Nyctaginaceae), Phyllocoptes cedri Keifer, 1946 rec. nov. on Cedrus deodara (Roxb. ex D. Don) G. Don (Pinaceae), and Diptacus hamedanicus Jafari & Khanjani, 2020 rec. nov. on Prunus triloba Lindl. and Prunus armeniaca L. (Rosaceae).

Two new genera, three new species and three new records of eriophyoid mites from China are described and illustrated: Medicavarus rhododendrus gen. nov. et sp. nov. from Rhododendron delavayi Franch. (Ericaceae); Rhycanonaequitas laevifolia gen. nov. et sp. nov. from Magnolia laevifolia (Y.W. Law & Y.F. Wu) Noot. (Magnoliaceae); Cosella quihouis sp. nov. on Ligustrum quihoui Carr. (Oleaceae); Rhombacus eucalypti Ghosh & Chakrabarti, 1987 rec. nov. on Eucalyptus sp. (Myrtaceae); Keiferana neolitsiae (Channabasavanna, 1966) rec. nov. on Cinnamomum burmanni (Nees et T. Nees) Blume (Lauraceae); Petanovicia cathartica Zhao, Li & Wang, 2018 rec. nov. on Allamanda schottii Pohl (Apocynaceae).

Two new genera and seven new species of eriophyoid mites from China are described and illustrated. They are Alveacaphyllisa clethra gen. nov. & sp. nov. on Clethra barbinervis Sieb. et Zucc. (Clethraceae), Acaricalus liquidambarus sp. nov. on Liquidambar formosana Hance (Altingiaceae), Abacarus dendrocalamus sp. nov. on Dendrocalamus hamiltonii Nees et Arn. ex Munro (Poaceae), Tetra spina sp. nov. on Dalbergia hupeana Hance (Fabaceae), Paraepitrimerus rhododendrus sp. nov. on Rhododendron delavayi Franch. (Ericaceae), Diabsentophyes saurauia gen. nov. & sp. nov. on Saurauia sp. (Actinidiaceae), Diptacus liquidambarus sp. nov. on Liquidambar formosana Hance (Altingiaceae). In addition, images of the characteristics of five new record species are provided, they are: Setoptus semiornatum Pye, 2011 rec. nov. on Pinus sp. (Pinaceae), Calacarus capsica Chakrabarti & Mondal, 1979 rec. nov. on Capsicum annuum Linn. (Solanaceae), Calepitrimerus glacialis Keifer, 1961 rec. nov. on Cryptomeria japonica var. sinensis Miq., 1870 (Cupressaceae), Phyllocoptruta citricola Chakrabarti & Sarkar, 2011 rec. nov. on Citrus maxima (Burm.) Osbeck (Rutaceae) and Diptilomiopus davisi Keifer, 1969 rec. nov. on Macadamia ternifolia F. Muell. (Proteaceae).