Triochochermes rhamnisugus (Li, 1994), comb. nov.

(Figs. 185–186)

Trioza rhamnisuga Li in Li & Sun, 1994: 526.

Triozopsis rhamnisuga; Li (2005: 203).

Trioza naria Kwon, Suh, An & Huh, 1996c: 468, syn. nov.

Material examined. South Korea: 3 ♀, 8 immatures, CB, Danyang-gun, Maepo-eup, Gapyeong-ri, San 58-1, 37°03'21.65"N 128°16'32.01"E, 300 m, 13.vi.2018, Rhamnus ussuriensis (G. Cho), (SNU, in 95% ethanol) ; 1 ♂, 1 ♀, 4 immatures, GG, Yangpyeong-gun, Cheongun-myeon, Sillon-ri 630, 37°34'14.77"N 127°47'33.73"E, 300 m, 23.vi.2018, R. ussuriensis (G. Cho), (SNU, in 95% ehtanol) .

Distribution in Korea. CB, GB, GG, GN (Kwon et al. 1996 c, 2016, as T. naria; Kwon & Kwon 2020, as T. naria) (SNU).

Host plant. Rhamnus ussuriensis J.J. Vassil. (Rhamnaceae) .

Comments. Trioza rhamnisuga was described from China based on females collected on Rhamnus davurica (Li & Sun 1994) . Trioza naria was described from a single male from Korea (Kwon et al. 1996c). A series of adults and immatures which we recently collected on R. ussuriensis fit both T. rhamnisuga and T. naria . We formally synonymise the two species names here and move the species to Trichochermes as Trichochermes rhamnisugus (Li in Li & Sun, 1994), comb. nov.