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The morphology and pair-forming acoustic signals of Isophya sicula sp. n., a new phaneropterine bush-cricket species from the Eastern Carpathians (Romania) is described. The species is morphologically similar to I. posthumoidalis and I. camptoxypha, but the male calling song differs clearly from the songs of those species. The male calling song is a long series of evenly repeated, very short syllables. Syllables are much shorter than in I. camptoxypha, and the song is composed from only one syllable type differently from I. posthumoidalis, where the male calling song is composed of two syllable types. Pair formation is achieved during an acoustic duet. The delay of female response (40–70 ms) is shorter than in I. camptoxypha and I. posthumoidalis. Basic descriptive statistics of sonometric and morphometric characters of the new species as well as SEM photos of the male stridulatory file and female stridulatory bristles are presented.