1. The song of the cicada (genus : Cicadatra) has been studied.

  2. The wave-form of the song shows two modes of amplitude modulation: (a) a slow modulation, period 8·3 msec; (b) a fast modulation, 40–75 μsec. growth and 185–250 μsec. decay.

  3. There is indication of wave distortion and instability at the beginning and end of the song.

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