35 spp. in 7 genera of 2 subfamilies in our area, >420 spp. in 55 genera worldwide placed in 3 subfamilies(1)
They have punctate body, small head with large mandibles, bulging humpbacked thorax, a stalked abdomen attached low on the thorax.
Main diagnostic characters(1)
Prepectus lying in same plane as, and fused to, pronotum (95%)
Pronotum small and hidden by the head dorsally (100%)
Gaster usually relatively small with a very long petiole (98%)
Forewing with marginal vein moderately long, stigmal and postmarginal veins extremely short (100%)
external parasitoids of the immature stages of ants(1)