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Couplet 120
120a: Antenna geniculate, club usually of 3 antennomeres; elytra short and truncate, exposing two non-flexing terga; body compact (Figure 26-23A) Histeridae p.407
120b: Antenna not obviously geniculate, with or without club; elytra rarely exposing 2 terga, if 2 terga exposed, then exposed abdominal segments flexible; body not oval or body cylindrical and compact
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