Fig. 14. Resonances of the forewings. (A) Free vibration of the right tegmen as recorded from region 4 with a probe microphone (red outline) and with a laser vibrometer (blue outline). Free vibration of the right (B) and left (C) wing of P. pallicornis recorded by laser vibrometer over region 1 of both wings; scale bar, 2 ms. Vibrations were induced by simulating single file-tooth/scraper impacts in dissected wings. The Q values presented above each oscillogram are means of four specimens. Power spectral analysis is shown below each oscillogram, with specimens shown in different colour outlines.