1. Metasoma with a syntergite (sometimes with
second tergite separate as a small anterior ring, but no posterior tergites
visible) (a). Two apical segments of female antennae immovably conjoined (). Wing veins
do not reach wing edge (a) ...2
— Metasoma with posterior tergites visible
(A). The two apical segments of antennae always movable (B). Wing veins reach
wing edge ...3
2. Second tergite separate as a small anterior
ring (a). Scutellum laterally smooth; apical ridge small (b). Subcosta running
near wing edge. Common ...Dilyta
— Second tergite merged with syntergite (A).
Scutellum with lateral ridges (B) and pronounced apical ridge (B). Subcosta
running near middle of wing. Rare ...Apocharips
3. With mesopleural line (a). Variable but
usually more "figitid-looking", darkly colored, with a long marginal cell (b)
...Phaenoglyphis
— Without mesopleural line (A). Usually tiny,
pale, with a short marginal cell (B) ...Alloxysta
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