 The larvae of these solitary wasps feed on cockroaches, and develop inside the egg-cases (oothecae) of their hosts.Evaniidae have the metasoma attached very high above the hind coxae on the propodeum, and the metasoma itself is quite small, with a long, one-segmented, tube-like petiole, and compressed laterally over most of its length (segments 2-8).The ovipositor is short and thin.