Diplazontinae wasps are recognized from their three-toothed (tridentate) mandibles with a notched upper tooth, a box-like first abdominal segment). The upper tooth of the mandibles is wide and notched, making the mandibles look three-toothed. The clypeus is separated from the face by a distinct groove. The head is transverse (broader than long). The first segment of the metasoma (abdomen) is wide, rectangular, and box-like with spiracles placed near or in front of the middle. The ends of the hind tibia are dark.

Associated with fly and hoverfly larvae.

Summer.

Adults lay their eggs into fly and hoverfly larvae.

It appears to be widespread in Britain, but the exact status is difficult to determine due to lack of records.

Status in Leicestershire and Rutland not known.