New data on the bush-cricket Montana medvedevi (Orthoptera: Tettigoniidae), critically endangered in Europe (EU 28), and a comparison of its song with all known song patterns within the genus Author Ivković, Slobodan Author Iorgu, Ștefan Author Horvat, Laslo Author Chobanov, Dragan Author Korsunovskaya, Olga Author Heller, Klaus-Gerhard text Zootaxa 2017 4263 3 527 542 journal article 33072 10.11646/zootaxa.4263.3.5 594bb190-aacd-4326-b9ad-01a5c3123366 1175-5326 573657 FF8FC6FD-0BE0-43EB-A5C4-881A4C70D792 Montana tomini (Pylnov, 1916) — Figs. 7 J1, 7J2. Localities : Russia , S Siberia , Tuva , 3.5 km to N of village Ersin ( N 50°15' , E 95°09' ), 12.ix.1986 , leg. O. Korsunovskaya ( 2 males ) . Mongolia , Selenge Aimag, Khonin Nuga , meadows, ( N 49°05' , E 107°18' ), 900–1000 m a.s.l. , 20–21.viii.1997 , leg. K.- G. Heller ( 1 male ) . Mongolia , Selenge Aimag, Tal ca. 20 km east northeast (D) Züünkharaa ( N 48°54' , E 106°42' ), 1050 m a.s.l. , 19.viii.1997 , leg. K.- G. Heller ( 1 male ) . Mongolia , Töv Aimag, forested hills, ca. 20 km north of Tereldsch ( N 47°48' , E 107°42' ), 1850 m a.s.l. , 15.viii.1997 , CH 5317, leg. K.- G. Heller ( 1 male ; Fig. 7 J2). The most characteristic property of the calling song of M. tomini is the extraordinarily large duration of its syllables ( Fig. 7 J). At 20°C the last syllable of a bi-syllabic echeme lasted about 200 ms. Only M. helleri is in the same range (150 ms at 30°C). However, both species differ considerably in the number of impulses per syllable: M. helleri has 32 impulses (and 39 teeth in the stridulatory file; Ciplak et al 2006 ), M. tomini ca. 80 impulses (and 108 teeth; Fig. 6 C). Concerning the number of syllables per echeme, there is a surprising variability ( Figs 7 J1, 7J2). One animal ( CH 5317) showed consistently always three to six (eight) syllables per echeme (cage recording at 16°C), the others only two to four.