Checklist and provisional atlas of singing cicadas (Hemiptera: Cicadidae) of Bulgaria, based on bioacoustics Author Trilar, Tomi Slovenian Museum of Natural History, Ljubljana, Slovenia https://orcid.org/0000-0003-0636-2881 ttrilar@pms-lj.si Author Gjonov, Ilia Sofia University, Faculty of Biology, Department of Zoology and Anthropology, Sofia, Bulgaria https://orcid.org/0000-0002-4239-9756 gjonov@cicadina.com Author Gogala, Matija Slovenian Academy of Sciences and Arts, Ljubljana, Slovenia matija.gogala@guest.arnes.si text Biodiversity Data Journal 2020 8 54424 54424 http://dx.doi.org/10.3897/BDJ.8.e54424 journal article http://dx.doi.org/10.3897/BDJ.8.e54424 1314-2828-8-e54424 00D3F97C107752E784967973F66E47A8 Cicadetta cantilatrix Sueur and Puissant, 2007 Distribution General distribution (only acoustically-validated data): Southern Europe : Bulgaria, France, Italy, Montenegro, North Macedonia, Romania, Serbia, Slovenia; Central Europe : Austria, Czech Republic ( Malenovsky and Lauterer 2017 ), Germany, Hungary, Poland, Switzerland; Eastern Europe : Russia ( Benediktov and Mikhailenko 2017 ) (all data except for the countries with the citation in brackets are summarised by Hertach et al. 2015 and Hertach et al. 2016 ). Distribution in Bulgaria : In our survey Cicadetta cantilatrix was found for the first time in Bulgaria. The species was found in four localities in southern Lower Mountain Pre-Balkan, southern Balkan Mts., Kraishte-Ichtiman and Kyustendil-Blagoevgrad Middle Struma valley (Fig. 43 ) with altitude distribution between 400 and 1200 m (Fig. 44 ). The lowest point where the species was found was the Berende izvor of the Nishava River at Stara Mt. (495 m a.s.l.) and the highest point at Tsarvenyano below the Radomir peak at Konyavska Mt. (1168 m a.s.l.). Notes Acoustic behaviour : The song was described by Gogala and Trilar (2004) , Hertach (2004) , Trilar and Holzinger (2004) , Gogala et al. (2005) , Trilar et al. (2006b) (all previous citations under the name Cicadetta cerdaniensis ), Sueur and Puissant (2007b) , Hertach (2011) and Benediktov and Mikhailenko (2017) . The calling song is a sequence of repeated two-phase echemes (Fig. 45 ): the first phase is long with low-intensity (duration 120-1030 ms) and the second phase is short high-intensity pulse (duration 23-60 ms) ( Sueur and Puissant 2007b , Benediktov and Mikhailenko 2017 ). At the beginning of the sequence, the low-intensity parts of the echemes are missing or are of the same duration as the high-intensity pulses. Later, the duration of the low-intensity parts increases steadily and is longest at the end of the sequence. Echeme duration and inter-echeme duration are negatively correlated ( Hertach 2011 ), which is not the case in closely-related species. Singing males can emit echemes at equal intervals for 7-10 minutes or even longer ( Benediktov and Mikhailenko 2017 ). Most of the spectral energy in the frequency domain is between 11 kHz and 18 kHz. The dominant frequency is not constant, but does not show a clear modulation pattern and averages 13 kHz ( Sueur and Puissant 2007b ). The courtship song and the alarm song (rivalry song or distress call) were described by Benediktov and Mikhailenko (2017) . Selected sound samples of Cicadetta cantilatrix are available on the web pages Songs of the European singing cicadas ( Gogala 2020 ). Materials : Suppl. material 10 Diagnosis Cicadetta cantilatrix (Fig. 42 ) inhabits variable, well-structured margins of thermophilic forests along extensively used meadows. Males usually sit on low trees or shrubs, sometimes even in the herb layer when they emit their calling song (Hertach 2007).