Apolygus subhilaris

Apolygus subhilaris (Yasunaga, 1992) Figures 8 C, 8 D, 9 AA, AB, 11 G, 11 H, 15 L, 17 J, 17 K, 19 AA, AB Lygocoris (Apolygus) subhilaris Yasunaga 1992 a: 20 (original description); Yasunaga 1992 b: 531 (key to species); Schuh 1995: 805 (catalogue). Apolygus subhilaris Kerzhner and Josifov 1999: 68 (catalogue); Seong and Lee 2007: 323 (diagnosis, key to species, images of habitus and male genitalia); Kim and Jung 2016: 597; Kim and Jung 2018 a: 5 (figures of habitus, molecular data); Oh et al. 2018: 471 (species list); Yasunaga 2023: 10 (species list, key to species, habitus images, SEM). Material examined. Non-type material. Japan, Russia: Amur Prov., Primorsky Terr. • 7 ♂♂, 3 ♀♀. Diagnosis. Length in male 4.7–5.2 mm, in female 5.1 mm. Head yellow with yellow clypeus, sometimes clypeus brown apically (Fig. 15 L); antennal segment I mostly yellow, often brown to dark brown apically and with brown to dark brown marking ventrally; antennal segment II brown to dark brown, sometimes with yellow to pale brown ring in basal half; pronotum yellow, scutellum varying from uniformly yellow to brown, corium yellow to pale brown with brown to dark brown marking posteriorly, sometimes mostly brown; lateral margin of embolium brown; cuneus yellow or with red tinge with brown base and apex; pleura yellow, sometimes with reddish tinge, metathoracic scent gland evaporative area whitish yellow; coxae yellow, sometimes with red tinge; femora yellow, often with red tinge, with red or brown rings in apical half; dark brown markings at base of spines on tibiae present; base of tibiae with small pale brown to brown marking. — Male genitalia. Apical process of right paramere twice shorter than paramere body (Fig. 19 AA); wing-shaped sclerite ca. 4–5 × as long as wide with straight outer margin, surpassing sublateral sclerite, subequal to half of ventral sclerite, as wide as ventral sclerite and wider than median sclerite; sublateral sclerite present, toothed, triangular with acute angle; needle-shaped sclerite very short or indistinct (Fig. 17 J). Distribution. Previously this species was recorded from Japan (Yasunaga 1992 b, 2023) and South Korea (Seong and Lee 2007; Kim and Jung 2016; Oh et al. 2018). Here we report it for the first time from Russia: Primorsky Territory and Amur Province (ZIN). Host plants. In Korea this species was recorded from Lespedeza bicolor (Fabaceae) (Seong and Lee 2007). Notes. All specimens of this species included in this work were previously identified as Apolygus hilaris. The two species are very similar externally. Apolygus hilaris can be differentiated by the dark brown to brown clypeus (Fig. 15 E). Additionally, its vesica has a long needle-shaped sclerite, which is distinctly longer than the wing-shaped sclerite (Fig. 18 A, B). The vesica structure of A. subhilaris specimens examined by us corresponds to that depicted in Yasunaga (1992 a) and Seong and Lee (2007). Among the vouchers used for the molecular work, we found two specimens from Primorsky Territory which are very similar to A. subhilaris in coloration (M 197, M 124; Fig. 11 I, J), however, they have the needle-shaped sclerite in the vesica reaching the secondary gonopore (Fig. 17 H, I). There are several species which have similar coloration and illustrations of vesica were not published for them and those three specimens can belong to one of them, i. e., Apolygus angustus (Zheng & Wang, 1983), Apolygus kosempoensis (Poppius, 1915), Apolygus myittae (Distant, 1904), Apolygus triangulus (Zheng & Wang, 1983), Apolygus umbratus (Poppius, 1914), or can represent a new species. Therefore, we publish the illustration of habitus and male and female genitalia for those specimens which can be useful for the future revisions of Apolygus.