Falcerminthus parvus (Baroga-Barbecho & Robillard, 2020)

(Figs 1–5)

Lebinthus parvus Baroga-Barbecho et al., 2020: 419

Falcerminthus parvus —Tan et al., 2021: 1077 (new combination)

Specimens examined. PHILIPPINES • 1♁; Mindanao, Misamis Oriental, Gingoog City, Barangay Lunotan, foot of Mt Balatukan; 14 February 2023; coll. A.M. Sabang, A. Gono, D.C.M. Bahoy & K. Grumo; MIN.23.39 (ZRC)

Remarks. This species was first described in 2020 but the calling song was not known. The morphology and genitalia of our male specimen resemble that of the holotype (Fig. 2).

Ecology. We observed this species dwelling among foliage of ground-over plants and moss among dead log in open forest (Figs 1, 3, 4).

Type locality. PHILIPPINES, Mindanao Island, Misamis Oriental, Gingoog City, Barangay Lunotan

Distribution. PHILIPPINES (Mindanao Island: Misamis Oriental, Bukidnon, Agusan del Sur)

Calling song (1J, 29.2±1.2°C) (Fig. 5). The calling song consists of an echeme including an average of 77±11 discrete syllables (41–90 syllables). The first few (ca. 10) syllables tend to be of lower amplitudes and erratic in duration and intervals; amplitude of syllable gradually increases to a maximum and stabilises at one third of echeme duration. Each echeme has a duration of 1.08±0.13 s (0.61–1.25 s). The average syllable duration is 7.23±0.75 ms (5.60–8.50 ms) and average interval between consecutive syllables is 5.87±0.95 ms (3.90–7.60 ms). The frequency spectrum is pure-tonal and forms a harmonic, with the energy peaking at the fundamental frequency. The dominant frequency is 18.46±0.45 kHz (17.91–19.41 kHz).