Localities: Romania, Botoșani, Hilișeu-Horia, N 48°00.60', E 26°17.40', 210 m a.s.l., 25.vi.2012, leg. I. Ș. Iorgu (Iorgu et al. 2013). Russia, Kursk (Centralno-Chernozemny Reserve), vii.2014 and 2015, leg. A. Benediktov, A. Mikhailenko (3 males).
The calling song of this species is quite complicated. Two different echemes are combined to a phrase and this phrase is repeated in a fast sequence at least for a few minutes (longest uninterrupted recording 2 min). One echeme consists of three short syllables with high amplitude (syllable repetition rate ca. 60–70 Hz at 24–25°C), the other of five longer ones (syllable repetition rate ca. 20–30 Hz at 24–25°C; Fig. 7 B) with lower amplitude. When an animal starts to sing, it often produces only the high-amplitude echemes, separated by longer intervals, and then added the low amplitude echemes. In a recording lasting 15 minutes the animal omitted the low-amplitude echemes several times and used only the loud ones with the corresponding silent intervals.