Nine new species of eriophyoid mites from the Hengduan Mountains, southwestern China are described and illustrated. They are Cosella delavayi sp. nov. on Castanopsis delavayi Franch. (Fagaceae); Tegonotus fabris sp. nov. on Abies fabri (Mast.) Craib (Pinaceae); Phyllocoptruta hodginsii sp. nov. on Fokienia hodginsii (Dunn) Henry et Thomas (Cupressaceae); Calvittacus mollissimus sp. nov. on Castanea mollissima (Fagaceae); Anthocoptes artemisia sp. nov. on Artemisia sp. (Asteraceae); Tetraspinus fabaceae sp. nov. on Cajanus cajan (L.) Mill sp. (Fabaceae); Neorhynacus molle sp. nov. on Rhododendron molle (Blume) G. Don (Ericaceae); Rhyncaphytoptus dielsianus sp. nov. on Trema dielsiana Hand.-Mzt (Ulmaceae) and Konola mollissima sp. nov. on Castanea mollissima (Fagaceae). All these new eriophyoid mite species are vagrants causing no apparent damage to their host plants.