FIGURE 4 in Rediscovery of Southern Barbed-wire Bush-cricket, Onconotus servillei Fischer von Waldheim (Orthoptera: Tettigoniidae: Tettigoniinae: Onconotini) in Serbia, with notes on species' calling song at the westernmost border of its distribution area

FIGURE 4. Oscillograms (A–D) and frequency spectrum (E) of calling song of Onconotus servillei: A, C—male fromVajuga (Serbia) 18 VII 2019, air temperature 24°C; B, D—male from Pâclele muddy volcanoes (Romania) 23 VI 2014, air temperature 25°C; E—male from from Vajuga (Serbia). Blue—one group of sylalbles (echeme); red—opening hemisyllable; green—closing hemisyllable.