Key to species of Mucha

1 Arista plumose only on dorsal side (Fig. 5 E)............................................................... 2

- Arista plumose on both sides............................................................. M. plumosa Ozerov

2 Fore tibia straight, ventrally not concave at middle (Figs. 2 A, 6A).............................................. 3

- Fore tibia ventrally concave at middle (Figs. 1 A, 1B, 3A, 5A, 7A).............................. M. tzokotucha Ozerov

3 Surstylus pointed ventrally............................................................. M. rectotibialis Iwasa

- Surstylus pointed posteroventrally (Figs. 1 D, 3C, 5C, 7C)..................................................... 4

4 Antenna almost yellow; anepisternum mostly glossy, but posteriorly pruinose; hind tibia dark brown, but yellow at apical 1/2 (Figs. 1 A, B); lateral view of surstylus short, shorter than length of dorsal epandrium (Figs. 1 D, 5C)...... M. liangi sp. nov.

- Antenna yellowish brown, but ventrally darkened; anepisternum wholly glossy; hind tibia blackish brown with yellow apical ring (Fig. 3 A); lateral view of surstylus long, longer than length of dorsal epandrium (Figs. 3 C, 7C). M. yunnanensis sp. nov.