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3. Median carina of propodeum forming a cup-shaped structure (a1) anteriorly and propodeum with triangular lateral invaginations (a1, a2) that the metanotum projects into conspicuously.
3'. Median carina of propodeum rarely forming a cup-shaped structure (similar form in some species of Chrysocharis (aa1) with anteriorly split median carina). Propodeum never with similar invaginations.
a2 | ||
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Image credits: a1, a2: Schauff (1991). aa1: Hansson (1985a).