Key to Chinese species (males) of Phyllomyza

1 Palpus almost bare, without setulae...................................................................... 2

- Palpus with short setulae at tip and ventral side............................................................. 4

2 Palpus yellow, protruding, but not much broadened, 4.5 times as long as wide................... P. luteipalpus Malloch

- Palpus black, much protruding (stretched forward more prominent) and broadened................................. 3

3 Palpus very long, 1.5 times as long as height of head, parallel-sided; halter black, yellowish at base.. P. nudipalpus Malloch

- Palpus broad, 2 times as long as wide, leaf-shaped, tapering to apex; halter yellow................... P. dilatata Malloch

4 Halter orange brown; cercus with ventral appendix............................................. P. epitacta Hendel

- Halter yellowish white; cercus lacking ventral appendix...................................................... 5

5 Palpus length 0.2mm, pointed apically; first flagellomere hammer-shaped, 1.2 times as long as wide..... P. claviconis Ya ng

- Palpus inflated, blunted apically; first flagellomere approximately circular, 1.1 times as long as wide.................. 6

6 M1 between r-m and dm-cu as long as dm-cu.............................................................. 7

- M1 between r-m and dm-cu longer than dm-cu............................................................. 8

7 Vibrissal angle relatively flat in lateral view; gena narrow, approximately one-eleventh of eye height; palpus long, 5 times as long as wide (Fig. 1); surstylus upper blade of bifurcated tip slightly swollen and lower one swollen with sharp tip (Fig. 9).................................................................................... P. angustigenis sp. nov.

- Vibrissal angle relatively acute in lateral view; gena relatively broad, approximately one-seventh of eye height; palpus long, 7 times as long as wide (Fig. 4); surstylus upper blade of bifurcated tip slightly swollen and lower one slender with blunt tip (Fig. 15).............................................................................. P. euthyipalpis sp. nov.

8 Palpus long oval, 3.2 times as long as wide (Fig. 2); surstylus upper blade of bifurcated tip swollen and lower one without swollen, with sharp tip (Fig. 11).......................................................... P. cuspigera sp. nov.

- Palpus thick, 4.2 time as long as wide (Fig. 3); surstylus upper blade of bifurcated tip slightly swollen and lower one slightly swollen (Fig. 13)...................................................................... P. clavellata sp. nov.