Öz The present paper is based on the material collected in the last three years in different parts of Turkey. Most of it has been collected by O. K. Gülen and by myself mainly on jour- neys to Eastern Turkey, in 1953 to Van and Hakkâri and in 1954, to Elaztğ, Tunceli and particularly in the Bingöl dağ ran- ge. The results of my journeys were extremely interesting and added much to the knowledge of the Turkish fauna of Orthop- tera. Amongst the Tettigoniidae, ten new species are described and two known species are tedescribed below. Ali types of the new species are deposited in the British Museum (Natural History), paratypes are in the Zoological Insti- tute University of Ankara.