Isophya costata - Keeled Plump Bush-cricket
Brunner v. Wattenwyl, 1878

Description: A large and robust species (♂ 19-24 mm, ♀ 22-26 mm). The distance between the two eyes (the fastigium) is greater than in other species. The male's wings are about as long as the pronotum. The second half of the pronotum widens towards the end. The male cercus is thin and long, curving inwards at the end. The ovipositor is 14-16 mm long.
Similar species: the other Isophya species
Adults: from May to July
The song is louder than that of other Isophya species. It consists of solitary syllables, sometimes groups of syllables, followed by 2-3 second intervals.

Source: Orthoptera Species File, lab recording, 22°C

Grasslands, steppes, meadows.
Postglacial relict species. Isolated populations in different regions (e.g. Bakony, Balaton-felvidék, Budai-hg., Bükk, Mecsek, Villányi-hg., Alföld (Mártély), Mezőföld, Kisalföld).
Note: A highly protected endemic species of the Carpathian Basin.

Isophya costata, male
(Author: Ambrus András, source: ízeltlábú, CC BY 4.0)

Isophya costata, female
(Author: Balogh Diána, source: ízeltlábú, CC BY 4.0)