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17. Mesoscutal midlobe (a1) with 2 pairs of setae. Scape in males with sensory pits arranged at least along entire ventral margin of scape.
17'. Mesoscutal midlobe (aa1) with more than 2 pairs of setae. Scape in males with sensory pits (bb1, indicated with arrow) restricted to its apical third, the pits forming tight group, separated from each other by less than their own diameter (usually requires slide mounting of scape).
Elachertus Spinola, 1811 and male Xanthellum Erdös & Novicky, 1951
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Image credits: a1: Schauff (1985c). aa1, bb1: Schauff (1985b).