Key to the genera of Azeliinae of China (revised from Fan 2008)

1 Hind coxa setose on posterodorsal surface (Azeliini)......................................................... 2

- Hind coxa no setose on posterodorsal surface (Hydrotaeini).................................................... 3

2 Hind tibia with pd; katepisternal setae 1+(2–3)............................................... Thricops Rondani

- Hind tibia without pd; katepisternal setae 1+1........................................ Azelia Robineau-Desvoidy

3 Arista plumose................................................................ Potamia Robineau-Desvoidy

- Arista bare or with pubescence........................................................................... 4

4 Hind femur without pd ............................................................... Chuntiania gen. nov.

- Hind femur with pd ................................................................................... 5

5 Katepisternal seta 1+1; hind tibia with 1 pd ................................................................ 6

- Katepisternal seta 1+2; hind tibia with 2–3 pd .............................................................. 8

6 Apical part of fore femur without teeth or spine on ventral surface.............................................. 7

- Apical part of fore femur with 1–3 teeth on ventral surface........................... Hydrotaea Robineau-Desvoidy

7 Fore femur with 1 median p ............................................................... Xestomyia Stein

- Fore femur without median p ..................................................... Ophyra Robineau-Desvoidy

8 Epistoma projecting to frontal angle distinctly in profile.......................................... Drymeia Meigen

- Epistoma not projecting to frontal angle in profile........................................................... 9

9 Basisternum of prosternum with hairs; dc 2 + 4; hind tibia with 3–4 pd ................. Huckettomyia Pont & Shinonaga

- Basisternum of prosternum bare; dc 2+3; hind tibia with 1 pd ................................... Megophyra Emden