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Journal of Experimental Biology 52,507-517 (1970)
Published by Company of Biologists 1970

The Mechnics of Stridulation in Bush Crickets (Tettiginioidea, Orthoptera) : II. Conditions for Resonance in the Tegminal Generator

W. J. BAILEY ¹ and W. B. BROUGHTON ²

¹ Department of Zoology, University of Newcastle upon Tyne, England
² Animal Acoustics Unit, Sir John Cass College, London, E.C.3

1. Using isolated tegmina of the bush cricket Homorocoryphus nitidulus vicinus (Walker) mounted on the actuator described in a previous paper the parameters controlling tooth-impact rate have been varied.

2. Results have shown that the mirror frame can be thrown into resonant vibration at between 12 and 15 kHz. when the tooth-impact rate approaches these values.

3. The situation in the Homorocoryphus type of stridulation is compared with that of the Conocephalus type where resonance does not occur.

4. The tooth-impact rate in H. n. vicinus is coupled with the frequency of natural vibration of the mirror frame via a plectrum-pivot-frame system which is made to act as a cantilever with the pivot at the mesial end of the vestigial file and the plectrum as the point of excitation.

5. The problem of acoustic coupling involving mechanical and air-column systems is discussed.

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