Chelyolygus bipuncticollis Yasunaga 2024, new combination

Chelyolygus bipuncticollis (Poppius, 1915), new combination (Figs. 1I, J, 2 A−D, 20A–F) Lygus bipuncticollis Poppius, 1915: 25. Lygocoris (Neolygus) bipuncticollis: Lu & Zheng, 1998: 186 (new combination). Neolygus bipuncticollis: Zheng et al., 2004: 388 (new combination, redescription). Type material. Holotype: Male, TAIWAN: Kankau (Koshun) [= currently Hengchun of Pingtung Co., 22°00′N, 120°45′E], H. Sauter, July 1912 (deposited in Senckenberg German Entomological Institute) [image examined]. Additional material: TAIWAN: 1 male, Pingtung Co., Kenting National Park, Xianglin Village, Badenixi Stream, 22°02′N 120°50′E, J. F. Tsai, 25 December 2012 (NMNS) (AMNH _ PBI 00378775). Diagnosis. This new species is currently known by two male specimens mentioned above and recognised readily by the following characters: Orange-yellow basic colouration; oily-shiny, highly polished, impunctate and hairless dorsum (Fig. 20A) with characteristic fuscous spots or maculae on pronotum, scutellum and hemelytron (Fig. 1I, J); fully darkened clypeus; darkened apical ¼ of pale antennomere I; and unique form of male genitalia as described below. Further external features were described by Poppius (1915) and images of the holotype male are available on a database (National Museum of Natural Science, 2023). The male genitalia are herein described for the first time, but the female is yet to be found. Description. Male genitalia (Fig. 2A–H): Left paramere C-shaped, similar in general shape to that of Apolygopsis species (but apex of hypophysis lacking lateral process) (Fig. 2D, E); right paramere with bifurcate hypophysis (Fig. 2G, H) and apical protuberance on sensory lobe (Fig. 2F). Vesica with two stout spicules and small, rounded secondary gonopore (Fig. 2A–C). Measurements. See Table 1. Distribution. Taiwan (Pingtung). Biology. Unknown. Remarks. This Taiwanese taxon has been regarded as a member of the speciose Holarctic genus Neolygus since the treatment by Zheng et al. (2004). However, the present examination on the surface structures and male genitalia warrants its placement in Chelyolygus, new genus. For instance, the highly polished, nearly glabrous dorsal surface is not exhibited in Neolygus, and the principal morphology of the male and female genitalia is significantly different between the two genera (cf. Yasunaga, 1991, 2023, 2024; Yasunaga et al., 2018). Based on these morphological evidences, a new combination, Chelyolygus bipuncticollis (Poppius), is herein established.