Trichochermes Kirkaldy, 1904, sensu novo

Comments. In the «best ML tree» of Percy et al. (2018: Figure S2), Trichochermes walkeri (Foerster, 1848) and Trioza rhamni (Schrank, 1801) constitute a strongly supported monophyletic group and both are associated with Rhamnus . The two species share the weakly inclined head, the long genal processes which are slightly constricted basally, the 1+3 apical metatibial spurs, the long, relatively narrow, apically pointed forewings with a long undulating vein Rs, and the relatively massive male proctiger. These morphological characters and the host genus are shared with Trioza naria Kwon, Suh, An & Huh, 1996c, Trioza marginepunctata Flor, 1861 and Trioza rhamnisuga Li, 1994, suggesting that they all are congeneric. We propose following new combinations: Trichochermes marginepunctatus (Flor, 1861), comb. nov., Trichochermes rhamni (Schrank, 1801), comb. nov. and Trichochermes rhamnisugus (Li, 1994), comb. nov. For Trioza naria see below. Apart from the Palaearctic species, Ouvrard (2020) also lists one Afrotropical and three Neotropical Trichochermes species which do not fit the above description and may not be congeneric with T. walkeri, the type species.