Bioacoustics of Kalarko ferruginosus

Measurements . Range and mean (in mm) for 10 males and 8 females (includes largest and smallest specimens). Length of body (including head): male 24.6–27.9 (26.3); female (including ovipositor) 32.0–36.5 (34.2). Length of forewing : male 30.2–33.9 (32.3); female 37.1–39.8 (38.2). Width of head (including eyes): male 7.3–7.9 (7.6); female 8.4–9.1 (8.7). Width of pronotum (across lateral angles): male 7.8–9.1 (8.3); female 9.3–10.6 (9.8). Distinguishing features . Body colour largely uniform reddish brown that, together with its few markings and long slender body and wings, make this species unlikely to be confused with any other. It differs from all other species by the distinguishing features listed in the generic description above. Song ( Figs 32a–b ). Recordings were obtained at the WA.GIL and WA.NON paratype locations, from Lake Douglas ( 30° 50.655’ S 121° 23.077’ E ), and from a site ~ 50 km W. of Balladonia . Males produce a calling song during sustained flight in evening dusk conditions. The song is a rapid train of two-pulse syllables, with the pulses of each syllable separated by about 0.01 s and with the syllables produced at 10.0–11.5/sec. In some syllables the pulses appear as doublets, with each having a weak secondary pulse. The song is somewhat high-pitched for the body size, concentrated around 9.5–15.5 kHz with a peak of 11–12 kHz. There is no frequency modulation. A male can be attracted by rapid finger snapping as it passes nearby. One male thus attracted landed on the arm of the responding investigator. Males were not observed to produce sounds while perched on vegetation as in some Yoyetta species that also sing in flight.