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Couplet 164
164a: Mid and hind tarsi with same number of tarsomeres; body elongate, flattened (Figure 26-58B); head usually with distinct temples before abruptly constricted neck; fore coxa either closed behind or open; if open (Brontinae), elytra transversely flat or slightly concave between slightly to distinctly raised interstria between stria 6 and 7; elytron with scutellary striole; base of mandible with dorsal setose pit (mycangium) hidden beneath clypeus when closed; antenna filiform, with scape more than 3X length of pedicel Silvanidae p.431
164b: Hind tarsus with 1 less tarsomere than mid tarsus; other characters variable
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