Fletcher Wildlife Garden. Found on the underside of an ash leaf. Some species of these parasitic wasps focus on the larvae of moths, flies and some butterflies, while others are parasitic on beetles. They are an odd-looking wasp with very enlarged hind legs. To see a photo of one of the Chalcid wasps (a parasite on Buprestid beetles): http://www.pbase.com/laroseforest/image/151619327