 Two Evaniidae species, "Evania appendigaster" and "Prosevania fuscipes", have achieved an essentially worldwide distribution nowadays, having been introduced along with various Blattidae species of genera "Blatta" and "Periplaneta".While they do feed on insects that are considered pests, they rarely attain population sizes sufficient to act as effective biocontrol agents.As cockroaches are typically more abundant in and around human settlements, Evaniidae are a regular sight in such habitat where many other wasps are absent, and are frequently encountered in buildings looking for prey.