Eurytoma trjapitzini Zerova et Klymenko, sp. n. is described. The new species belongs to the pistaciae species group differing from all known species by numerous (10–12) long setae on hind tibia (2–3 in the other species) and on hind femur. An improved key to species of the pistaciae group is provided. The holotype and paratypes of the new species are deposited in the collection of the I. I. Schmalhausen Institute of Zoology, Kyiv.