Abstract
1. The peripheral tympanal region of the Tettigonioidea (long-horned grasshoppers) has been investigated by means of the scanning electron microscope. 2. The tympana are composed of two membranous parts having different structure. There is an outer, ellipsoid region with a honeycomb structure comparable to that of the surface of the forelimb exoskeleton; around this lies a thin crescent-shaped membrane with a fibrillar texture. The latter part is probably relatively elastic and capable of oscillation. 3. The actual site of the auditory receptors in these grasshoppers, the crista acoustica, takes the form of a row of scolopidia; the sizes of the scolopidia decrease progressively from proximal to distal. The cap cells of the scolopidia are covered by the tectorial membrane; in the middle and distal region of this membrane there are supporting bands running lateral to the cap cells.
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