ABSTRACT
Clypeus reduced, separated from frons by suture, or vertical and hidden beneath frons. Labrum distinct, prominent, projecting beyond apex of front of head, clypeal apex deeply emarginate, bisinuate, or truncate. Mandibles projecting beyond apex of labrum, large, curved, toothed, blunt. Maxillae with 4-segmented palpi; galea with apical hook; submentum large, prominent; mentum large, emarginate at apex; labium with 3-segmented palpi.
