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20. [Males only, females with 2 funicular segments] Clypeal margin (a1) sharply incised and male antenna with 3 funicular segments, flagellar segments unbranched. Scutellum without submedian grooves. Metanotum strongly sculpted, and dorsellum crenulate/multidentate (c1). Propodeum (c1) with complete median carina and plicae.
20'. Clypeal margin usually not incised (only in Dasyeulophus and Dimmockia, with a lobed clypeal margin). Antenna almost always with 4 funicular segments in males [3 in a few Microlycus], almost always 2-3 of them branched (bb1). Metanotum usually smooth, never with crenulate dorsellum. Propodeum often with incomplete or absent median carina and plicae.
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Image credits: a1: Askew (1968). bb1: Ikeda & Huber (1996)