Bioacoustics of Ornebius lupus

Diagnosis. The new species has genitalia which appear most similar to those in the species group Ornebius ( rufonigrus ) Ingrisch, 1987 , but differs by the dark-grey colouration; the maxillary palps being not so elongated (more similar to Ornebius alvarezi Tan, Ingrisch, Baroga-Barbecho & Yap, 2019 from the Philippines ; elongated oblong in Ornebius dumoga Ingrisch, 2006 from Sulawesi and in Ornebius consternus Ingrisch, 2006 from Sulawesi), the FW colouration darker (orange in O. dumoga and in Ornebius rufonigrus Ingrisch, 1987 from Indochina and Malay Peninsula) and less covered by the pronotum (compared to O. consternus ). The male genitalia of this new species differ from congeners from the species group by the internal sclerites at base being smaller instead of expanded. We also compared the new species with other species currently not placed in any species group (i.e., with unknown male genitalia). Our species resembles species with wholly dark/ black or smoky FWs, such as Ornebius obscuripennis ( Chopard, 1930 ) from Sarawak and Ornebius fuscipennis ( Chopard, 1929 ) from Sumatra (including Padang, Pulau Sipura, Pulau Telo and Batu Islands). The new species differs from O. obscuripennis by the pronotal lateral lobe and lateral parts of the head being dark-grey (i.e., unicolorous with dorsal parts) instead of forming a yellow lateral band. It also differs from O. fuscipennis by much smaller body size (BL 8.4 vs. 10.5 mm ; PL 2.8 vs. 4.5 mm ; TL 2.5 vs. 2 mm ; FIIIL 4.4 vs. 7 mm ); by the FW more uniformly coloured instead of smoky with posterior margin blackish; by the apical segment of the maxillary palps longer than subapical and third; by the pronotal disc not covered with yellow-brown scales; and by the legs that are not unicolourous yellowish. Lastly, the new species also differs from a syntopic species, Ornebius tampines Tan & Robillard, 2012 by the overall body and FW colouration, the body shape is more typical of Ornebius , instead of slenderly built, the shape of the male genitalia and by the calling songs (see Tan et al ., under review). It is also somewhat similar to a sympatric species, O. pullus by the wholly black FWs, but differs by the lack of white margins along the lateral lobe and the posterior margin of the dorsal disc of the pronotum, by the shape of male genitalia and by the calling songs (see Tan et al ., under review)