Couplet 12.
propodeum very short, its medial keel reduced to a mere point, its ill-defined dorsal areas, the petiole and the extreme base of the large tergite, clothed with a flocculent pubescence; petiole not longer than wide; hind wings without a closed basal cell
propodeum normal and with a long median keel, its dorsal areas and base of large tergite bare; petiole longer than wide and with at most a few longish hairs; hind wing with a closed basal cell