Abstract
The labellar taste hairs of the blow flies, Phormia regina and Calliphora vicina, have an opening mechanism at the tip which consists of two stump cuticular prongs and a funnel-like cuticular pouch. Opening and folding of these structures are regulated by the pressure within the dendrite-free lumen of the hair. The extrusion of viscous substance at the tip of the taste hair is possible through spongy cuticle and one pore in each prong; it seems likewise to depend on the pressure within the dendrite-free lumen and results in regional collapsing of this lumen. Described and discussed are: The cuticle and pores of the structures at the hair tip, pore filaments which extend from the dendrites, and the number and arrangement of the dendrites.
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