Oscillograms of calling songs A–F and rivalry songs G,H in Chorthippus maritimus from Primorskiy kray (A) Macedonia (B) Sukhumi region (C) and Saratov region (G). Song recordings are presented at three different speeds (faster oscillograms of the indicated parts of the songs shown in D,E,F,H). In all oscillograms the two upper lines are recordings of hind leg movements and the lower line is the sound recording. The ambient temperature near a singing male was 33 – 34°C in (A) and 29 – 30°C in other cases.