Trichochermes grandis Loginova, 1965

(Figs. 166–169)

Trichochermes grandis Loginova, 1965: 204 .

Trichochermes gemellus Loginova, 1974b: 57, syn. nov.

Trichochermes jilinanus Li & Yang, 1985: 307; synonymised with Trichochermes sinicus by Li (2011: 1411); synonymised with Trichochermes gemellus by Kwon & Kwon (2020: 197).

Trichochermes laricis Li & Yang, 1985: 309; synonymised with Trichochermes sinicus by Li (2011: 1411); synonymised with Trichochermes gemellus by Kwon & Kwon (2020: 197).

Trichochermes sinicus Li & Yang, 1985: 303; synonymised with Trichochermes gemellus by Kwon & Kwon (2020: 197).

Type material examined. Trichochermes grandis: Russia: Holotype ♂, Primorsky Krai, Chandalaz Range, Kangauz Station, 27.vii.1962 (Kovalev), (ZIN, dry mounted); paratypes : 5 ♂, 6 ♀, same data as holotype (ZIN, dry and slide mounted); 3 ♂, 2 ♀, same data but, Chandalaz Range, Mount Pedan, 24.vi.1962 (Kovalev), (ZIN, dry mounted) ; 1 ♂, 1 ♀, same data but, 12 km from Vladivostok, Akademgorodok, 12.vii.1961 (Trjapitzin), (ZIN, dry mounted) ; 2 ♂, 1 ♀, same data but, Tachingou Bay, Sokolovka, 26.viii.1959 (Kerzhner), (ZIN, dry mounted) ; 2 ♂, same data but, 25 km S Sokolovka, Kievka, 29.viii.1959 (Kerzhner), (ZIN, dry mounted).— Trichochermes gemellus: Mongolia: Holotype ♂, Dornod Aymag, Numregijn-gol River, 32 km SE Mount Salkhit, 23.vii.1971 (Emeljanov), (ZIN, dry mounted); paratypes : 4 ♂, 3 ♀, same data as holotype (ZIN, dry mounted); 1 ♂, 1 ♀, same data as holotype but, 22.vii.1971 (ZIN, slide mounted) .

Other material examined. Russia: 1 immature, Primorsky Krai, Chandalaz Range, Mount Pedan, 24.vi.1962 (Kovalev), (ZIN, dry mounted) ; 3 ♂, 2 ♀, Primorsky Krai, Ussurisky Nature Reserve, 12.viii.1970, Rhamnus (Konovalova), (IBSS, slide mounted) ; 1 ♂, 1 ♀ (identified as T. gemellus), same data but, 1 km SE Barabash-Levada, 15.vi.1978 (S. Belokobylskij), (IBSS, slide mounted) . South Korea: 1 ♀, GN, Mt. Weonhyosan, 30.v.1980 (Y.J. Kwon), (NIBR, dry mounted) ; 3 ♂, 1 ♀, same data but, 31.v.1980 (Y.J. Kwon), (NIBR, dry mounted); 2 ♂, 3 ♀, JJ, Mt. Hanlasan, 22.vii.1981 (Y.J. Kwon), (NIBR, dry mounted) ; 1 ♀, GW, Pyeongchang-gun, Jinbu-myeon, Mt. Odae, 04.viii.1983 (Y.J. Kwon), (NIBR, dry mounted) ; 1 ♂, 1 ♀, GW, Hongcheon-gun, Nae-myeon, Gwangwonri, San 197-1, Sambong National Recreation Forest, N37°51'25.14" E128°27'48.33", 800 m, 06.vi.2015 (G. Cho), (SNU, in 95% ethanol) ; 23 immatures, 5 exuviae, GW, Pyeongchang-gun, Daegwanryeong-myeon, Yongsan-ri, San 142, N37°36 ›26.2" E128°40'22.2", 1400 m, 17.vi.2020, Rhamnus davurica (G. Cho), (SNU, in 95% ethanol) .

Distribution in Korea. GB, GG, GN, GW, JJ (Miyatake 1971; Kwon & Lee 1981; Kwon 1983; Kwon et al. 2016, as T. gemellus; Kwon & Kwon 2020, as T. gemellus) (NIBR, SNU).

Host plant. Rhamnus davurica Pall. (Rhamnaceae) (Kwon 1983).

Comments. According to Loginova (1974b), Trichochermes grandis and T. gemellus differ from each other in the body colour, size and forewing pattern (with each a brown stripe basally and apically in T. grandis and variable in T. gemellus). We compared type material (ZIN) of both species and found no significant morphological differences, including in the male and female terminalia suggesting the two are conspecific. We propose, therefore, the following new synonymy: Trichochermes grandis Loginova, 1965 = Trichochermes gemellus Loginova, 1974, syn. nov.