New records and a new synonym of Orthoptera from Bulgaria

After a revision of available Orthoptera collections in Bulgaria, 9 species with one subspecies are added and 15 species and one subspecies are omitted from the list of Bulgarian fauna. A supplement to the description and a diagnosis of Isophya pavelii Brunner von Wattenwyl (= Isophya rammei Peshev, syn.n. ) is presented. Full reference and distributional data for Bulgaria are given for 31 taxa. Oscillograms and frequency spectra of the songs of Barbitistes constrictus , Isophya pavelii and I. rectipennis are presented.