Atanycolus yangi sp. nov. (Hymenoptera, Braconidae), a new species parasitizing the flatheaded wood borer, Lamprodila nobilissima bellula (Lewis) (Coleoptera: Buprestidae), is described. Lamprodila nobilissima bellula is a serious wood boring pest of Rosacea trees in North China. We collected adult specimens of A. yangi sp. nov. searching for hosts on infested tree trunks and confirmed the host-parasitoid association by dissecting parasitized hosts from infested trees in the field and rearing the parasitoid from L. nobilissima bellula -infested host tree logs in the laboratory. Adult images for both sexes of the new parasitoid species are provided. A morphological identification key to Oriental and Palaearctic species similar to A. yangi sp. nov is also presented.