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 macedonica Schedl, 1999 Distribution General distribution: Southern Europe : Greece, North Macedonia, Romania, Serbia ( Gogala and Trilar 2016 ); Central Europe : Czech Republic ( Malenovsky and Lauterer 2017 ) (all data except for the countries with the citation in brackets are summarised by Sanborn 2014 ). Distribution in Bulgaria : Cicadetta macedonica was found for the first time in Bulgaria in 50 localities in northern lowest hills of the Pre-Balkan, southern Lower Mountain Pre-Balkan, northern Balkan Mts., southern Balkan Mts., Kraishte-Ichtiman, Pirin Mt., Dabrash-Batak western Rhodope Mts., Prespa-Chernatitsa western Rhodope Mts., eastern Rhodope Mts. and Strandzha Mt. (Fig. 47 ). The majority of the population is distributed between 400 and 1200 m (90% of the population) (Fig. 48 ). The lowest point where we have recorded this species is near Kalovo at Mladezhka reka in Strandzha Mt. (162 m a.s.l.) and the highest western Rhodopes near the deviation Batak-Dospat-Sarnitsa (1491 m a.s.l.). Notes Acoustic behaviour : The song was described by Gogala and Trilar (1999) , Gogala and Trilar (2004) and Gogala et al. (2008) . The many-minutes lasting calling songs of Cicadetta macedonica consist of a series of short echemes (SE) with a single long echeme (LE) at the end (Fig. 49 ). The song sequence usually begins with very long period of SE repetitions lasting over one minute and ends with LE. The sequences of phrases then follow with shorter series of SE followed by one LE. The SE duration is 26 +/- 5 ms, the interval between them 63.4 +/- 12 ms, the repetition frequency is about 11 +/- 1 Hz and the LE duration is 161 +/- 20 ms. The next phrase starts after an interval of half a second. The song contains frequencies from 5 to 20 kHz with a maximum between 12 and 14 kHz ( Gogala and Trilar 1999 , Gogala and Trilar 2004 , Gogala et al. 2008 ). Selected sound samples of Cicadetta macedonica are available on the web pages Songs of the European singing cicadas ( Gogala 2020 ). Materials : Suppl. material 11 Diagnosis Cicadetta macedonica (Fig. 46 ) inhabits sparse thermophilic forests, mainly oak forests and also mixed deciduous forests. The males sing in the trees on prominent branches, but also on isolated smaller trees or shrubs or even in the grass in forest clearings, where females gather to find mating partners ( Gogala and Trilar 1999 ).