These solitary wasps are often called cuckoo, or ruby-tailed, wasps. They have a heavily armoured, brightly coloured cuticle. The apical gastral segments have been modified to form a thin, tubular structure that can be telescoped into the hind end of the gaster. In the female this tubular structure has been secondarily modified to act as an ovipositor. They have a parasitoid life history.
