Arboridia koreana sp. nov. Oh et Jung

(Figs. 1, 3, 5, 7, 9–15)

Description. Vertex brown with two black preapical spots, apex with pair of indistinct brown markings (Fig. 3). Frontoclypeus brown laterally, yellowish brown medially (Fig. 5). Anteclypeus brown (Fig. 5). Pronotum with two black spots on anterior margin, other spots small and irregular. Mesonotum with two large black triangles bordered with yellow. Scutellum brown. Forewings brown, veins yellow (Fig. 7). Legs yellow without pattern. Abdomen yellow with brown stripes. Male abdominal apodemes short and thick extended to 4th sternite (Fig. 14).

Male genitalia. Pygofer lobe bilobed apically with scattered microsetae, Process with 2 points, posterodorsal point shorter and narrower than ventral point (Fig. 13). Subgenital plate with 3 macrosetae near middle and microsetae along lateral margin from base to apex (Fig. 15). Style with second point large and first and third point short (Fig. 11). Aedeagus in lateral view with dorsal apodeme well developed but slender, preatrium well developed, shaft slender, tapered and curved slightly dorsad through most of length, apex slightly widened in lateral and posterior views, with pair of short preapical lateral projections (Figs 9-10). Connective thin and long, arms slender (Fig. 12).

Measurements. Body length males 2.8–3.0mm, female 2.9mm.

Type materials. Holotype: [CNU] 1♂, Korea, Daejeon, Mt. Maebang, on Platycarya strobilacea, 13.vi. 2014, coll. S.M.Oh. Paratype: [CNU] 1♂, Korea, Daejeon, Chungnam National University, on Platanus occidentalis, 20.ii.2014, coll. S.M.Oh; [CNU] 1♂, Korea, Namhae, Butterfly Park, 13.vii.2011; [CNU] 1♂,1♀, Korea, Pocheon, Korea National Arboretum, 05.ix.2011; [CNU] 1♀, Korea, Pocheon, Korea National Arboretum, 04.x.2011; [CNU] 1♂, Korea, Daejeon, Yuseong, on Rubus idaeus var. concolor, 20.v.1990. coll. K.R.Choe; [CNU] 1♂, Korea, Daejeon, Yuseong, on Alnus japonica, 25.iv.1990. coll. K.R.Choe.

Host plants. Platycarya strobilacea Siebold & Zucc. (Juglandales: Juglandaceae), Rubus idaeus var. concolor (Kom.) Nakai. ( Rosales: Rosaceae), Alnus japonica (Thunb.) Steud. ( Fagales: Betulaceae)

Distributions. Korea (Daejeon, Namhae, Pocheon)

Remarks. This species is similar to Arboridia agrillacea (Anufriev, 1969), but differs in the shape of the style and process of the pygofer. This species hibernates under the bark of Platanus occidentalis L. ( Proteales: Platanaceae) in winter in Korea.

Etymology. The specific name is derived from country of the type locality.