Gomphocerus (Bolivarianus) acutus Karabağ, 1957 stat.n.

Material: Male specimens collected from Turkey, Rize, İkizdere-İspir road, Ovit Mountain, N 40.600000, E 40.856111, 2323 m, 19.viii.2015, (leg. A. Mol, D. Sirin & M.S. Taylan) ; Erzurum, Palandöken Mountains, N 39.823889, E 41.291944, 2890 m, 22.viii.2015 (leg. A. Mol, D. Sirin & M.S. Taylan) and male calling song recorded from three males in the field and laboratory (or room) conditions by authors .

Description of male calling song: In totally, three records from three males were examined. The main component of a calling song consists of a phrase, lasting 13.92–17.18 s and composed of about 42–71 syllables (Fig. 4A). The phrase begins quietly and crescendo structure and is reached the maximum intensity at the 30–40 syllables (1/2 of the phrase) (Fig. 4A). Each syllable (RPU) lasts in 210–340 ms. Oscillographic analysis shows that a syllable consists of two different parts (Figs. 4B and 4C). The syllable begins with the low-amplitude part (with unified indistinct pulses without gap) which last 92–138 ms and the second part of the syllable (duration: 105–194 ms) includes higher amplitude distinguishable 8–10 pulses.