Abstract: The adult bee, le Anoplophora horsfieldi (Hope) adopts two different ways in sound production, I.e, thoracic stridulation and elytral vibration. The thoracic stridulation sounding(TSS) may be produced successively and plays the role of both enemy repelling and intraspe cific communication. The elytral vibration sounding (EVS), which is produced non-succes sively and induced by external stimulus, has the role mainly for enemy repelling. The TSS consists of a series of sound groups, each of which, running about 1100 to 1600 ms, ordinally consists of up-stroke syllable (US) (384±22 ms, 250-350,) pulse train(PT) interval 1 (270-600 ms), down-stroke syllable (DS) (382±16 ms, PT 250-350) and interval 2 (80-360 ms). The power-spectrum of US is formed by the basic sound (BS) and its partial. The BS gives the main part of the signal power and the main peak frequency at 742±30 Hz in males and 603±34Hz in females. The EVS consists of 7 to 9 PT with higher amplitude and frequency and running about 7 to 10 ms. Though the frequencies of EVS's PT distribute from 0 to 3100 Hz in the power-spectrum, the power mainly lies within 850 to 1050 Hz. The EVS of the beetle is a more effective display in enemy repelling by its higher energy content and sudden release as compared with TSS.

Key words: Anoplophora horsfieldi——stridulation——elytral vibration