Rhacocleis germanica - Mediterranean Bush-cricket
(Herrich-Schaeffer, 1840)

Description: Medium-sized, slender species (♂ 14-20 mm, ♀ 15-27 mm). Usually brown, but may also be grey or black. The wings are vestigial in both sexes. Ovipositor is 14-19 mm, slightly curving upwards. The male's cerci have a large, inward-pointing spine at the base.
Similar species: Pachytrachis gracilis
Adults: from June to October.
Song:
The buzzing, very rapid song consists of short chirps (0.2-0.7 sec) repeated every 1 to 3 seconds. It sings mainly at night. Its voice is barely audible, but can be easily be observed with a bat detector (at 30 kHz).

Source: Orthoptera Species File (lab recording, high pass filter, 25 °C)
Habitat:  Rocky places, open forests, shrubs. Thermophilic. It prefers tall vegetation.
Distribution:
Rare in hills and mountains, mostly on the southern slopes (e.g. Mecsek, Transdanubian Hills, Naszály, Cserhát, Mátra).

Rhacocleis germanica, male
(Author: Ján Svetlík, source: flickr.com, CC BY-NC-SA 2.0)

Rhacocleis germanica, female
(Author: Nagy Sándor, source: ízeltlábúak.hu, CC BY 4.0)