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SEM images the tip of labium of C. nigrescens. (A) Vertical view of the tip of labium showing 11 sensilla basiconca IV (Sb 4), sensilla trichodea III (St 3), and sensilla trichodea IV (St 4); (B) half view of labial tip showing 11 sensilla basiconica IV (Sb 4) and apical plate (ap); (C) enlarged view of sensillum trichodeum IV (St 4); and (D) enlarged view of sensillum trichodeum IV (Sb 4).
