Recently a new Isophya species was discovered in Harghita Bâi, Romania: I. sicula . The species is morphologically similar to I. posthumoidalis and I. camptoxypha , but the male calling song is different. In this Zootaxa paper the species is described, with an extensive treatment of the different songs.
Source: K.M. Orci, G. Szövényi & B. Nagy 2010. Isophya sicula sp. n. (Orthoptera: Tettigonioidea), a new, morphologically cryptic bush-cricket species from the Eastern Carpathians (Romania) recognized from its peculiar male calling song. Zootaxa 2627: 57-68.
available from: http://www.mapress.com/zootaxa/2010/f/zt02627p068.pdf