Synopsis of Nothybidae (Diptera: Brachycera) from China, with redescription of Nothybus absens Lonsdale & Marshall Author Zhou, Jiale 0000-0002-8901-3187 Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China & https: // orcid. org / 0000 - 0002 - 8901 - 3187 Author Marshall, Stephen A. 0000-0002-5732-9718 Insect Systematics Lab, School of Environmental Sciences, University of Guelph, Guelph, N 1 G 2 W 1, Ontario, Canada https: // orcid. org / 0000 - 0002 - 5732 - 9718 Author Yang, Ding Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China text Zootaxa 2021 2021-02-05 4926 2 201 223 journal article 8300 10.11646/zootaxa.4926.2.3 8eb7fd40-5f23-4c11-9a20-3cb6c55260a8 1175-5326 4506019 AEAA4653-8556-4332-983C-480AFBD8C084 Key to species of Nothybus from China [Simplified from Lonsdale & Marshall (2016) ] 1 Distal quarter of wing infuscated, except for 2 discreet circular spots anteriorly in radial cells, and sometimes one ill-defined pale patch in cell m 1 ( Figs 7 , 25 , 34 )...................................................................... 2 - Distal quarter of wing with dark brown apical and subapical bands; pale area between bands encompassing three clear spots ( Figs 44 , 63 , 83 )...................................................................................... 4 2 Velvety anterolateral patches on frons confluent, black area thus continuous across lower frons ( Fig. 4 ); fore basitarsomere almost entirely white, with basal and distal dark areas no longer than diameter of tarsomere ( Fig. 8 )............. N. absens - Velvety anterolateral patches on frons separate, black area of lower frons interrupted medially ( Figs 22 , 31 ); fore basitarsomere white except for dark apex and base, basal dark area several times longer than diameter of tarsomere ( Figs 26 , 35 )......... 3 3 Abdominal tergites mostly yellowish orange with dark markings posteromedially and along lateral margin ( Figs 20 , 27, 28 )............................................................................................ N. acrobates - Abdominal tergites almost entirely dark brown ( Figs 29 , 36, 37 )...................................... N. biguttatus 4 Subapical clear spots of wing arranged in a straight transverse line; vein CuA 1 with subapical spot usually distinct ( Figs 44 , 63 )................................................................................................. 5 - Subapical clear spots of wing not arranged in a straight line and middle spot in cell r 4+5 displaced apically, subapical spot on vein CuA 1 faded or absent ( Fig. 83 )................................................................ N. sumatranus 5 Abdominal tergite 3 dark brown ( Fig. 46 ); tergite 4 mostly dark brown, with large orange patches on each side ( Figs 46–48 ); anterior margin of surstylus almost straight ( Fig. 76 )................................................... N. kempi - Abdominal tergite 3 laterally reddish brown to orange ( Fig. 58 ); tergite 4 almost entirely reddish brown to orange, medial strip and anterior and posterior margins narrowly darkened ( Fig. 65 ); anterior margin of surstylus strongly convex ( Fig. 77 )........................................................................................... N. kuznetsovorum