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14. Mesoscutal midlobe (a1) with 1 pair of setae (the posterior pair) and scrobal grooves (b1) long and narrow, extending almost parallel and very close together to end separately in the straight transverse frontal groove near the median ocellus (facial collapse may make the transverse groove appear V-shaped), and clypeus (b1) set off by distinct sutures.
14'. Mesoscutal midlobe almost always with 2 pairs of setae, or scrobal grooves broaly separated (bb1). Clypeus often not set off by distinct sutures (bb1); transverse fronto-facial groove often v-shaped. [Closterocerus (Achrysocharis) differs only in that the clypeus is not outlined by sutures]
b1 | bb1 | |
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Image credits: a1, b1, c1: Hansson (1994b). bb1: Hansson (1996a).