Taxonomy and bioacoustics of little-known Grylloidea crickets (Orthoptera, Ensifera) from Mindanao, Philippines Author Tan, Ming Kai Block 207 A, Woodleigh Link, Singapore 361207, Republic of Singapore Author Salvador, Jewel Anne G. Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Sabang, Aira Mae M. Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Bahoy, Daphne Cayle M. Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Nuñeza, Olga Macas Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Robillard, Tony Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, SU, EPHE, UA, 57 rue Cuvier, CP 50, 75231 Paris Cedex 05, France. text Zootaxa 2023 2023-08-02 5323 3 301 348 http://dx.doi.org/10.11646/zootaxa.5323.3.1 journal article 10.11646/zootaxa.5323.3.1 1175-5326 8209415 C022FD72-9C54-4A89-A880-3D99F52C8499 Ornebius bioculatus Tan, Ingrisch, Baroga-Barbecho & Yap, 2019 ( Fig. 36 ) Ornebius bioculatus Tan et al. , 2019b: 170 Specimens examined. PHILIPPINES • 1♁; Mindanao , Misamis Oriental , Gingoog City , Barangay Lunotan , near Mt Sumagaya ; N8.70109 , E125.01304 , 1258.0±5.0 m.a.s.l.; 13 February 2023 , 20h35; mossy forest, on a dead branch; coll. M.K. Tan , J.A.G. Salvador, A.M . Sabang, A . Gono, D.C.M . Bahoy & K. Grumo ; MIN.23.15 ( MSUIIT ) Remarks. This species was first described from Siargao Island ( Tan et al. , 2019b ). The male collected near Mt Sumagaya resembles the type in the overall colouration; FWs pale yellow with the apex having a broad black margin interrupted by two pale spots; the shape and white colouration of paraproct process white; and the genitalia having a pair of lobes of lateral valve folded dorsoventrally, forming a spiral at the apex. Here, we recorded and describe the calling song for the first time and add a locality record for this scaly cricket. Ecology. This species were found in lowland secondary forest in Siargao Island as well as mossy forest at high altitude in Lunotan. Type locality. PHILIPPINES , Siargao Island Distribution. PHILIPPINES (Siargao Island; Misamis Oriental on Mindanao Island) Calling song (1J, 21.1±0.5°C) ( Fig. 36 ). The calling song is made up of echeme with variable number of discrete syllables; on average 13±3 syllables but ranges from 9 to 20 syllables. Consequently, each echeme has a duration of 5.08±1.26 s (3.08–8.27 s). The first few syllables tend to be of lower amplitudes; amplitude of syllable gradually increases to a maximum and stabilises. The average syllable duration is 51.3±3.5 ms (42.8–57.8 ms) and average interval between consecutive syllables is 375.6±5.7 ms (365.3–386.3 ms). The frequency spectrum is pure-tonal and forms a harmonic, with the energy peaking at the fundamental frequency. The dominant frequency is 5.53 kHz.