Eriophyoid mites from Qinghai Province, northwestern China with descriptions of nine new species (Acari, Eriophyoidea)

Eriophyoid mites from Qinghai Province, northwestern China were studied herein. Up to now, only six species have been reported from Qinghai Province. In field surveys, 17 eriophyoid mite species were collected, among which nine species were found new to science. The new species and their host plants are listed as follows: Acaphyllisa tuberculumaesp. n. on Populus sp. (Salicaceae); Proiectus xiningensissp. n. on Pinus sp. (Pinaceae); Phyllocoptes beishaniensissp. n. on Spiraea mongolica Maxim. (Rosaceae); Tetra prunianasp. n. on Prunus tomentosa Thunb. (Rosaceae) Rupr. (Berberidaceae); Tetra pyrianasp. n. on Pyrus calleryana Decne. (Rosaceae); Tetra simoniasp. n. on Populus simonii Carr. (Salicaceae); Diptacus berberinussp. n. on Berberis amurensis Rupr. (Berberidaceae); Diptacus mengdaensissp. n. on Lonicera elisae Franch. (Caprifoliaceae); Rhyncaphytoptus spinussp. n. on Lonicera rupicola Hook. f. et Thoms. (Caprifoliaceae). Aculops ulmi Hong & Xue, 2005 was re-described.