Hexacentrus karnyi Griffini 1909

Hexacentrus karnyi Griffini, 1909 [A] CH 4982 ♂ The song of this species (two males recorded in the field at night) was in its basic structure (Fig. 15) similar to that of the Asiatic species H. unicolor Serville, 1831 (Heller, 1986) and other Hexacentrus species (e.g., Ichikawa et al. 2006), but it is much slower in echeme and syllable repetition rate. It consisted of a series of echemes, repeated at intervals of 8���12 s (0.5 s in H. unicolor). The syllable repetition rate was around 50 Hz (T= 21 ��C), again much slower than H. unicolor, which heats up before singing and reaches more than 300 Hz. Each echeme (duration about 0.7 s) started with a distinct impulse, probably indicating the opening of the tegmina. Similar isolated impulses can be seen in the song of the other species, but usually shortly after an echeme and produced during a final wing closure. The peak of the spectrum was situated at 9.7 kHz, close to that of 11 kHz observed in H. unicolor (Heller, 1986).
Published as part of Heller, Klaus-Gerhard, Hemp, Claudia, Liu, Chunxiang & Volleth, Marianne, 2014, Taxonomic, bioacoustic and faunistic data on a collection of Tettigonioidea from Eastern Congo (Insecta: Orthoptera), pp. 343-376 in Zootaxa 3785 (3) on pages 368-369, DOI: 10.11646/zootaxa.3785.3.2, http://zenodo.org/record/250508
{"references":["Griffini, A. (1909) Note sopra alcune Phasgonuridae del Congo. Annales de la Societe entomologique de Belgique, 53 (1908), 9 - 28.","Serville, J. G. A. (1831) Revue methodique des insectes de l'ordre des Orthopteres. Annales des Sciences Naturelles Zoologie et Biologie Animale, 22, 28 - 65; 134 - 167; 262 - 292.","Heller, K. - G. (1986) Warm-up and stridulation in the bushcricket, Hexacentrus unicolor Serville (Orthoptera, Conocephalidae, Listroscelidinae). Journal of Experimental Biology, 126, 97 - 109.","Ichikawa, A., Ito, F., Kano, Y., Kawai, M., Tominaga, O. & Murai, T. (Eds.) (2006) Orthoptera of the Japanese Archipelago in color. Sapporo, 688 pp. + 2 CD."]}