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2. Tiny (about 1mm), stout-bodied wasps (a1, a2) with mesoscutum (a1: m) very broad, essentially hiding pronotum from dorsal view and scutellum (a1: s) projecting posteriorly over metanotum and medial part of propodeum, hiding them from dorsal view. Notauli absent, but axillar grooves (axilla=a1: a) often resembling notauli curving at right angles; scutellum with 2 or more pairs of setae (which may be very tiny).
2'. Usually larger wasps. Pronotum and medial part of propodeum almost never hidden from dorsal view, but if so, then notauli obvious and complete (aa1: n. Eprhopalotus) or indicated (aa2: n. Euderinae: Hubbardiella) only in posterior half of mesoscutum. Scutellum with 1 pair of setae in similarly tiny Entedoninae.
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Image credits: a1, a2: LaSalle & Schauff (1994). aa1: Schauff (1991). aa2: Schauff, et al (1997).