Abstract: Acantholyda qinghaiica Wei & Wu, sp. nov., is a new species of Pamphiliidae damaging Picea crassifolia. The pest was collected from Qinghai Province, China. The new species is similar to Acantholyda peiyingaopaoa Xiao, 1963 damaging P. crassifolia Kom. in China, but differs from it in: The clypeus largely black in female and entirely black in male; the postocellar area as long as broad, without middle furrow and with fine middle carina; OOL:POL=2; the third antennomere as long as the combination of antennomeres 4 and 5 together; the width to length ratio of harpe is more than 2; penis valve round at ventral apical corner, the ventral caudal corner angulated. The holotype and 108 paratypes of the new species are deposited in the Insect Collection of Central South University of Forestry and Technology, Changsha, Hunan, China (CSCS). Six paratypes are kept in the Insect Collection of Forest Diseases and Pest Control & Quarantine Station of Qinzhou District, Gansu, China.

Key words: Hymenoptera, Pamphiliidae, Acantholyda, new species, Picea crassifolia