- Oral region of face with round or elliptical circular opening below clypeus and above mandibles
- Long antennae with more than 16 antennal segments; usually more than 25
- Wings as in diagram
- Almost always between 4.0 and 9.0 mm in length
- First metasomal tergite and usually also second metasomal tergite with a median carina
- Second and third metasomal tergites fused
- Ovipositor short, ovipositor sheaths wide