Nothybus, Rondani, 1875

Zhou, Jiale, Marshall, Stephen A. & Yang, Ding, 2021, Synopsis of Nothybidae (Diptera: Brachycera) from China, with redescription of Nothybus absens Lonsdale & Marshall, Zootaxa 4926 (2), pp. 201-223 : 202-203

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 CuA1 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