Rectimarginalis ensis

Rectimarginalis ensis (Haan, 1843) (Figs 2E, 10, 11) Locusta (Phaneroptera) ensis Haan, 1843: 191, 194. Psyra ensis (Haan, 1843) in Brunner von Wattenwyl, 1878: 171 — Kirby, 1906: 427; Karny, 1923: 155. Holochlora ensis (Haan, 1843) in Karny, 1925: 40 — Karny, 1926a: 120; Karny, 1926b: 103; Otte, 1997: 134. Rectimarginalis ensis (Haan, 1843) in Liu & Kang, 2007: 190 — Tan, 2014: 587; Tan et al., 2019: 320. New material examined. EAST MALAYSIA; Sabah State • 2♂; Maliau Basin Conservation Area, at Maliau Basin Studies Centre dining area; N4.73668 E116.97468; 17 November 2024, 19h00; attracted to light; coll. M.K. Tan; SBH.24.126, 129 (ZRC) • 1♂; Maliau Basin Conservation Area, at Maliau Basin Studies Centre accommodation (Keruing); N4.73588 E116.97442; 17 November 2024, evening; attracted to light; coll. M.K. Tan; SBH.24.136 (ZRC). Type locality. Borneo. Calling song (Fig. 11). The calling song is an isolated echeme made up of an average of 4±1 syllables (3–5 syllables), although on rare occasions, the echeme can also be made up of up to 8 and 9 syllables. The average echeme duration is 0.27± 0.05 s (0.17– 0.37 s). Within each echeme, the average syllable duration is 9.4±1.8 ms (5.8–13.1 ms) and the average down time (silent interval between the two syllables) is 77.1±10.9 ms (63.4–111.5 ms). The average period of syllable is 86.5±10.2 ms (74.1–119.9 ms). The frequency spectrum is broadband and is not symmetrical and has a peak frequency of 9.83±0.87 kHz (7.59–10.97 kHz).