The genus Systenus Meigen, 1803 (Diptera: Dolichopodidae) from Yunnan, China, with descriptions of six new species Author Lin, Chen Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China & Institute of Life Science and Technology, Inner Mongolia Normal University, Huhhot 010022, China Author Zhang, Chunmin Tongliao Agricultural Technology Extension Center, Tongliao 028000, China Author Yang, Ding Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China text Zootaxa 2023 2023-12-11 5383 2 153 166 https://www.mapress.com/zt/article/download/zootaxa.5383.2.3/52446 journal article 10.11646/zootaxa.5383.2.3 1175-5326 10350971 1D2AD0FF-CE98-462C-A238-CC3DBF2906C9 Key to species (males) of Systenus from China 1 Antenna with very long postpedicel, 5–6 times longer than wide and very long arista ( Yang et al . 2011 , fig. 271a; Lin & Yang 2022 , fig. 1B)........................................................................................ 2 - Antenna rather short with short, thick postpedicel, at most 4 times longer than wide and rather short arista ( Figs 7 , 9, 11, 13, 15, 17)................................................................................................. 3 2 Arista with terminal flag ( Yang et al . 2011 , fig. 271a); R 4+5 and M 1 weakly convergent apically ( Yang et al . 2011 , fig. 271b); cercus simple, finger-like ( Yang et al . 2011 , fig. 271c).................................. S. sinensis Yang et Gaimari - Arista simple ( Lin & Yang 2022 , fig. 1B); R 4+5 and M 1 strongly convergent apically ( Lin & Yang 2022 , fig. 1A); cercus basally short and thick with long finger-like apical process ( Lin & Yang 2022 , fig. 1E)................ S. jinxiuensis Lin et Yang 3 Wing hyaline, without dark apical band; R 4+5 and M 1 convergent apically; abdominal segment 7 not petiolate............ 4 - Wing with wide grayish brown apical band ( Fig. 6 ); R 4+5 and M 1 parallel apically; abdominal segment 7 petiolate.......................................................................................... S. latimaculatus sp. nov. 4 Postpedicel 4.0 times longer than wide; cercus strongly bent ( Figs 7 , 15 )......................................... 5 - Postpedicel at most 3.3 times longer than wide (Figs 9, 11, 13, 17); cercus more or less straight....................... 6 5 Antenna wholly dark brown; R 4+5 and M 1 weakly convergent apically; cercus basally slightly thick, apically with long thick ventral process ( Fig. 16 ).............................................................. S. huanglianus sp. nov. - Antennal two basal segments dark brownish yellow; R 4+5 and M 1 strongly convergent apically; cercus basally very thick, apically with short thin ventral process ( Fig. 8 )........................................... S. apicidigitatus sp. nov. 6 Postpedicel distinctly elongated, 3.0–3.3 times longer than wide, arista apical (Figs 9. 11); thoracic pleura wholly metallic green; surstylus elongated with a small dorsal process near base................................................ 7 - Postpedicel short and wide, 2.0 times longer than wide, arista subapical (Fig. 13); thoracic pleura mostly dark yellow ( Fig. 4 ); surstylus short and thick without dorsal process near base................................... S. flavilateralis sp. nov. 7 Antennal scape and pedicel dark yellow; postpedicel 3.3 times longer than wide, basally slightly thickened (Fig. 9); surstylus geniculate with long finger-like dorsal process near base directed backward (Fig. 10); cercus bifurcated apically.............................................................................................. S. basiflavus sp. nov. - Antenna wholly blackish; postpedicel 3.0 times longer than wide, basally rather thickened, apically finger-like ( Fig. 11 ); surstylus nearly straight with very short dorsal process directed forward ( Fig. 12 ); cercus not furcated apically................................................................................................ S. digitatus sp. nov.