The Hatchet Wasps parasitise the egg cases (ootheca) of cockroaches (Blattodea). Comprised of four Australian genera.
References
Bradley, J. C. 1908. The Evaniidae ensign-flies, an archaic family of Hymenoptera. Transactions of the American Entomological Society 34: 101-19.
Deans, A. R. and Huben, M. 2003. Annotated key to the ensign wasp (Hymenoptera: Evaniidae) genera of the world, with descriptions of three new genera. Proceedings of the Entomological Society of Washington 105: 589-875.
Deans, A. R., Yoder, M. J. and Dole, K. 2015. Evanioidea Online – catalog of information about evanioid wasps (Hymenoptera). Accessed 24 October 2015. [http://evanioidea.info]