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Couplet 27
27a: Antenna usually without distinct club, either filiform moniliform, serrate or pectinate (Figures 26-5A-B); head not rostrate; if antenna distinctly clubbed, then club with 5 or more antennomeres, length of head from vertex to clypeal margin < to width of head just behind eyes
27b: Antenna with distinct club with 4 or fewer antennomeres (Figures 26-5H, 26-84B, 26-85A-D, 26-87A-G); or if antenna moniliform (Figure 26-5B), then head distinctly rostrate (Figure 26-84A); or if club composed of 5 or more antennomeres, then length of head from vertex to clypeal margin > width of head just behind eyes
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