Abstract
Baryscapus dioryctriae Yang & Song sp. nov. (Hymenoptera: Eulophidae), a gregarious pupal and larval endo-parasitoid of Dioryctria pryeri Ragonot and Dioryctria abietella Denis & Schiffermuller (Lepidoptera: Pyralidae) is described and illustrated. The hosts are serious pests of the cones, seeds, and twigs of Pinus koraiensis Sieb. & Zucc., a predominant forest tree species in the northeastern China. The parasitoid has potential as a biocontrol agent for the pests, as an average parasitism rate of 19.5% has been observed and 87.7 parasitoid adults (range 41–138) emerge from a single host. Detailed photographs of the key characters of the female and male of the new species are provided. Type specimens were deposited in Insect Museum, Chinese Academy of Forestry, Beijing, and the Insect Collection of Jilin Provincial Academy of Forestry, Changchun, Jilin Province, China, as well as China National Insect Collection at Institute of Zoology, Chinese Academy of Sciences, Beijing.
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