Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. High Quality Content by WIKIPEDIA articles! Evaniidae, also known as the ensign wasps or hatchet wasps, is a family of parasitic wasps. It numbers around 20 extant genera containing over 400 described species, and is found all over the world except in the polar regions. The larvae of these solitary wasps feed on cockroaches and develop inside the egg-cases (oothecae) of their hosts.

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