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Bulgarian planthopper fauna (Hemiptera: Fulgoromorpha) are relatively well studied, with 164 known species from 77 genera and 11 families. Data for some species from previous studies were reported without any localities or were incomplete and need to be updated. In the present study, 13 species of planthoppers are recorded for the first time in Bulgaria - Hyalesthes mlokosiewiczi Signoret, 1879 (Cixiidae), Delphax armeniacus Anufriev, 1970, Euides speciosa (Boheman, 1845), Eurysula lurida (Fieber, 1866), Florodelphax paryphasma (Flor, 1861), Jassidaeus lugubris (Signoret, 1865), Metropis aris Asche, Drosopoulos & Hoch, 1983, Oncodelphax pullula (Boheman, 1852), Ribautodelphax imitans (Ribaut, 1953), R. pungens (Ribaut, 1953), Stenocranus major (Kirschbaum, 1868) (Delphacidae), Latilica maculipes (Melichar, 1906) and Tshurtshurnella extrema Dlabola, 1980 (Issidae). Species from the following five genera are recorded in Bulgaria for the first time: Euides Fieber, 1866, Eurysula Vilbaste, 1968, Jassidaeus Fieber, 1866, Oncodelphax Wagner, 1963 (Delphacidae) and Latilica Emeljanov, 1971 (Issidae). As a result, the total numbers of known planthopper species and genera in Bulgaria become 177 species and 82 genera. The dataset of all collected specimens presented in this work was provided separately through Global Biodiversity Information Facility (GBIF). Detailed distribution of the species and comments on those from the European Red Lists are also provided.

The singing cicadas (Hemiptera: Cicadidae) of Bulgaria were poorly known. There are published records for 14 species: Cicada orni, Lyristes plebejus, Cicadatra atra, Cicadatra hyalina, Cicadatra persica, Cicadetta montana, Cicadetta mediterranea, Dimissalna dimissa, Oligoglena tibialis, Tympanistalna gastrica, Pagiphora annulata, Saticula coriaria, Tibicina haematodes and Tibicina steveni. Two species from this list were doubtful in the beginning of our study, since Tympanistalna gastrica is distributed in central and southern Portugal and Saticula coriaria is a north African species. We checked three major institutional collections housed in Sofia, Bulgaria: the National Museum of Natural History (SOFM), the Institute of Zoology (ZISB) and the Biology Faculty of Sofia University "St. Kliment Ohridski" (BFUS). We confirmed 11 of the species mentioned in literature, except Cicadetta mediterranea and found two additional species: Cicadatra platyptera and Cicadetta macedonica (the specimens in BFUS were bioacoustically confirmed). Based on this knowledge, we further investigated the singing cicadas of Bulgaria with the use of morphological and bioacoustic methods in the years 2008, 2009, 2010, 2012, 2016, 2018 and 2019. We were not able to confirm the presence of Cicadatra persica and Cicadetta mediterranea, but found three additional species: Cicadetta brevipennis s. lat., Cicadetta cantilatrix and Tettigettula pygmea. Using the bioacoustic methods, we also detected unknown singing patterns, which could belong to three or four additional taxa, which need to be described. The Bulgarian fauna of singing cicadas at the moment consists of 16 confirmed and 3-4 potential species.

The singing cicadas (Auchenorrhyncha: Cicadoidea) of Bulgaria remain poorly known. There are published records for 14 species (Arabadzhiev 1963, Barjamova 1976, Barjamova 1978, Barjamova 1990, Dirimanov and Harizanov 1965, Dlabola 1955, Gogala et al. 2005, Háva 2016, Janković 1971, Nast 1972, Nast 1987, Nedyalkov 1908, Pelov 1968, Yoakimov 1909): Lyristes plebejus, Cicada orni, Cicadatra atra, C. hyalina, C. persica, Cicadetta montana, C. mediterranea, Oligoglena tibialis, Tympanistalna gastrica, Pagiphora annulata, Dimissalna dimissa, Saticula coriaria, Tibicina haematodes and T. steveni. Two species from this list should be excluded from the list of Bulgarian cicadas, since T. gastrica is distributed in central and southern Portugal (Sueur et al. 2004) and S. coriaria is a north African species (Boulard 1981). We checked three major institutional collections housed in Sofia, Bulgaria: the National Museum of Natural History (NMNHS), Institute of Zoology (ZISB) and Biology Faculty of Sofia University "St. Kliment Ohridski" (BFUS). We confirmed 11 of the species mentioned in the literature, except C. mediterranea, and found 2 additional species: C. brevipennis and C. macedonica. Based on this knowledge, we further investigated the singing cicadas of Bulgaria with the use of classical and bioacoustic methods in the years 2008, 2009, 2010, 2012, 2016, 2018 and 2019. We were not able to confirm the presence of C. persica and C. mediterranea, but found three additional species: Cicadatra platyptera, Cicadetta cantilatrix and Tettigettula pygmea. Using the bioacoustic methods we also detected 3 to 4 additional taxa, which need to be described. Thus, the Bulgarian fauna of singing cicadas at the moment consists of 17+ species.

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