Stridulation of Homoeogryllus xanthographus (Guérin-Méneville, 1847), male observed in Gołuchów, Pleszew District (Poland): a. spectrogram of recorded stridulation series; b. spectrogram of one stridulation series in higher resolution of time domain; c. spectrogram of two type units (syllables). The oscillograms are shown below and the relative amplitude scales (in dB) on the right of the spectrograms. Abbreviations: dB, decibel; s, second; kHz, kilohertz.