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.
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.
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)