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Couplet 26
26a: Hind coxa without exposed posterior face; antenna never straight and clubbed; often with one of the following: antenna long and simple (Figures 26-73, 26-74), antenna geniculate and clubbed, head rostrate (Figures 26-87A,C), or hind femur enlarged
26b: Either hind coxa with distinct posterior face (at least medially) set off from ventral surface by a carina or flange, or antenna strongly or weakly clubbed but not geniculate and head not at all rostrate
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