Aproceros Malaise 1931

Aproceros Malaise, 1931 Figs 3, 11, 19–21, 26. Type species: Aproceros umbricola Malaise, 1931. Body size 4.5–7.0 mm. Labial palps with 4 segments, maxillary palps with 6 segments. Right mandible with basal tooth. Antennae of males bifurcate. Fore wings with 4 cells Rs; cell R open; vein Sc absent; vein 2r–m present; veins B and M join up at same point on vein R; cell 2A absent. Cell A of hind wing widely open. All tibiae without preapical spurs. The colour is usually black or brownish–red, without a metallic sheen. The genus is distributed in the Palaearctic (East and West) and Oriental regions. Number of species:World — 10; Palaearctic — 9. The larvae feed on the leaves of elms (Ulmus spp.). Aproceros leucopoda Takeuchi, 1939 is an invasive pest of elms (Ulmus spp.) that has spread widely over the last decade in central Europe (e.g., Blank et al. [2010, 2014]; Matosevic, Pernek [2011]; Zandigiacomo [2011]; Csoka et al. [2012]; Boeve [2013]; Glavendekic et al. [2013]; Pimpl [2014]; Sobczyk, Nuss [2014]; Doychev [2015]; Mol, Vonk [2015]; Vétek et al. [2017; 2022]; Denton [2018]; Hölling [2018]; Burton et al. [2019]; Sinchuk et al. [2021]) and Russia (e.g., Artokhin et al. [2012]; Lengesova [2012]; Shchurov et al. [2012]; Gninenko et al. [2013]; Lengesova, Mischenko [2013]; Sorokin [2013]; Blummer [2015]; Martynov, Nikulina [2017]; Kondratyeva et al. [2023]), and has also been accidently introduced to North America [Martel et al., 2021; Oten et al., 2023]. Males of Aproceros pallidicornis (Mocsáry, 1909) are further described in Choi et al. [2015]. The most complete identification key of Aproceros species is presented in Togashi [2003].