PLATE 1.10. QUEEN MOUTHPARTS, POSTERIOR VIEW

TOP. Mouthparts, posterior view. The innermost projecting piece represents the retracted glossa (tongue), which is much smaller than that of the worker. Distally the glossa is tipped by a (brightappearing) flabellum. At the base of the glossa are the bilobed paraglossae; these two pieces emanate from a flattened sclerite called the prementurn. Immediately lateral to the glossa are the two foursegmented labial palps. The one on the right of the glossa has been bent back to better display the underlying maxillary galea. When feeding, the two palps and the two galea come together to form a tube or funnel through which liquids are drawn up by the mechanical movements of the glossa and the suction created by the cibarium (not visible). (x 56)

BOTTOM RIGHT. Higher magnification of the underside of the queen glossa showing its bilobed construction, flabellum at the tip, and the sparse hairs (sensilla chaetica) of the lateral-lying labial palp. A few very short pegs (sensilla basiconica) are seen near the sensilla chaetica. Of particular interest is the high density and overlapping (at the tips) nature of the sensilla chaetica on the glossa. (x 121)

BOTTOM LEFT. Close-up of the underside of the left labial palp showing the two types of putative chemoreceptor sensilla, sensilla chaetica (the longer hairs) and sensilla basiconica (the very short but stout hairs). (x 327)