none Dendrosoter protuberans (Nees) was introduced into the United States from France as a possible addition to the existing spectrum of hymenopterous parasites of the smaller European elm bark beetle, Scolytus multistriatus (Marsham). D. protuberans is an external parasite; it oviposits through bark onto or next to late-instar larvae of S. multistriatus . The biology of Entedon leucogramma Ratzeburg has been described by Beaver (1966). E. leucogramma is an endoparasite of S. multistriatus . The female of E. leucogramma enters the egg gallery as it is being developed by the female bark beetle and oviposits in newly deposited bark beetle eggs. The female wasp advances into and retreats from the bark beetle egg gallery as the female bark beetle works in and out of the gallery. The larva of E. leucogramma develops internally in the larva of S. multistriatus as the latter matures. As the larva of S. multistriatus matures to a late instar, the parasite larva completes development, emerges from the remains of the bark beetle larva, and pupates. The purpose of this paper was to find out if D. protuberans oviposits on late-stage larvae of S. multistriatus already parasitized internally with a larva of E. leucogramma .