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Couplet 68
68a: Fore coxal cavity closed (except in Holopsis); head small, usually covered by hood-like pronotum; if head exposed from above, fore coxal cavities closed; mostly tiny beetles < 2 mm Corylophidae p. 434
68b: Fore coxal cavity open; head visible from above in front of pronotum; size variable, up to 11 mm
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