InsectsT. javanica Heteroptera Insecta, both male and female stridulate and the frequency is independent of the sex of the insect. An instrument is fabricated with a view to study the relative contributions of the components of the acoustic apparatus. These components are the striated wobbler, a comb-like structure and a folding membrane of the hind wing of the insect. It has been observed for the first time that the folding membrane is more effective in the process of stridulation. The comb acts only as an amplifier.