The genus Lithodusa Bey-Bienko, 1951 is revised, including the description of a new species. Its two species differ in many aspects of morphology, mainly in genitalia, and can most easily be separated by length of tegmina. The calling songs of both species are quite similar in amplitude pattern, as well as in spectral properties. The genus is distributed from the Caucasus to northeast Turkey. The relationships of Lithodusa to other genera of the Tettigoniidae/-inae are discussed and a list of genera belonging to Drymadusini presented.