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3(2). Apex of head ventrally produced; base of labium permanently distant from underside of head; trichobothira on head not set in deep pits
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-Apex of head not ventrally produced BUT may have prominent vertical plates (bucculae); labium usually either straight and lying closely parallel to head and thorax or permanently curved and so distant from underside of head; trichobothira on head set in deep pits
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