Labium (SEM). A. Extended ligula (gl – glossa, pa – paraglossa) in posterior view, acrosomal buttons (ab) at the apex; prm – prementum. B. Apex of glossa (gl), spatula shaped microtrichia (mi) of the dorsal side; pa – paraglossa, sba – sensillum basiconicum. C. Distal edge of the paraglossa with rows of microtrichia (mi) and sensilla basiconica (sba); ab – acrosomal button. D. Third segment of labial palpus (lp), female with thorn-shaped sensillum basiconicum (sba) and sensilla trichodea (str).