Key to species of the subpollinosa group from China

1. Postocellar setae minute, usually shorter than 1/3 ocellar setae in length (Fig. 10 A); wing usually fuscous along R1 (Fig. 2 A, B, F, G, J, K, M, P, Q), sometimes extend along costa (Fig. 2 C–E, H, I, L, N, O)................... subpollinosa group....2

- Postocellar setae normal, usually longer than 1/3 of ocellar setae in length; wing usually entirely hyaline, or with patch(es)/ band(s) not merely along R1 and costa................................................ other Leucophenga species

2. Wing fuscous along R1 only (Fig. 2 A, B, F, G, J, K, M, P, Q)....................................................3

- Wing fuscous along R1 and extend along costa (Fig. 2 C–E, H, I, L, N, O)......................................... 11

3. Halter yellow at base and stem, mostly dark brown at knob (Fig. 3 C, D)................................ L. flavicosta

- Halter entirely yellowish (Figs. 3 A, 3B, 4A–D, 4I, 4J, 5A, 5B, 5E, 5F, 6)........................................ 4

4. Paramere with a remarkable wrinkle subdorsally and several sensilla aligned above (Figs. 10 D, 14C, 15C, 24C, 25C)...... 5

- Paramere lacking any remarkable wrinkle subdorsally (Figs. 18, 19, 21 C)........................................ 9

5. Mesonotum entirely dark brown to black in male (Fig. 6 A, C); 2nd abdominal tergite slightly yellow laterally (Fig. 9 I–K)... 6

- Mesonotum brownish yellow, with four longitudinal stripes submedially and laterally in male (Figs. 3 A, 4A, 4C); 2nd abdom- inal tergite not yellow laterally (Figs. 7 A, 7B, 8C–G)......................................................... 7

6. Hypandrium lacking any sensillum (Figs. 24 B); aedeagus narrow down on posteroventral 1/3 and apically, slightly rhombic distally in lateral view, with 1 sensillum distally (Fig. 24 D).................................... L. rhombura sp. nov.

- Hypandrium with 4 sensilla (Fig. 25 B); aedeagus acute apically, broadened on posteroventral 1/2, slightly spoon-shaped in lat- eral view, lacking any sensillum (Fig. 25 D).................................................. L. rugatifolia sp. nov.

7. Epandrium with ca. 3 setae near ventral corner per side (Fig. 14 A).................................... L. umbratula

- Epandrium lacking any seta near ventral corner both side (Figs. 10 B, 15A)....................................... 8

8. Aedeagus rounded apically (Fig. 10 E)............................................................ L. argentina

- Aedeagus needle-shaped apically (Fig. 15 D)................................................ L. aculeata sp. nov.

9. Surstylus acute apically (Fig. 18 A)..................................................... .. L. cyclophylla sp. nov.

- Surstylus rounded apically (Figs. 19, 21 A)................................................................ 10

10. Second abdominal tergite yellow laterally (Fig. 9 D); paramere lacking any sensillum (Fig. 21 C)....... L. gracilenta sp. nov.

- Second abdominal tergite dark brown laterally (Fig. 9 A); paramere with ca. 5 sensilla distally (Fig. 19 C).................................................................................................. L. flaviclypeata sp. nov.

11. Wing fuscous at tip of R4+5 (Fig. 2 E); halter yellow at base and stem, mostly dark brown at knob (Fig. 3 I, J)....................................................................................................... L. subpollinosa

- Wing hyaline at tip of R4+5 (Fig. 2 C, D, H, I, L, N, O); halter entirely yellowish (Figs. 3 E–H, 4E–H, 5C, 5D, 5G–J).......12

12. Surstylus acute apically (Figs. 16, 17, 22, 23 A).............................................................13

- Surstylus rounded apically (Figs. 12, 13, 20 A)..............................................................16

13. Cercus larger than epandrium in lateral view (Fig. 23 A); aedeagus laterally with a process bearing a sensillum at tip (Fig. 23 D).................................................................................. L. magnicauda sp. nov.

- Cercus smaller than epandrium in lateral view (Figs. 16, 17, 22 A); aedeagus laterally lacking any process and sensillum (Figs. 16, 17, 22 D)......................................................................................... 14

14. Mesonotum entirely dark brown in male (Fig. 5 G); aedeagus thick, obviously broadened distally, with a small acute projection distodorsally (Fig. 22 D)................................................................. L. latipenis sp. nov.

- Mesonotum brownish yellow to brownish, with three brown, longitudinal stripes medially and laterally in male (Fig. 4 E, G); aedeagus slender, not obviously broadened distally, lacking any projection (Figs. 16, 17 D)........................... 15

15. Hypandrium with 1 sensillum (Fig. 16 B); aedeagus rounded apically, slightly ridgy submediodorsally (Fig. 16 D)............................................................................................. L. acuticauda sp. nov.

- Hypandrium with 3 sensilla (Fig. 17 B); aedeagus acute apically, not ridgy submediodorsally (Fig. 17 D).. L. cultella sp. nov.

16. Aedeagus thick, reticulated medially, laterally with a thick process lacking any sensillum (Fig. 12 D).......... .. L. formosa

- Aedeagus slender, lacking any reticulated, ventrolaterally with a thin process bearing a sensillum at tip (Figs. 13, 20 D)... 17

17. Abdominal tergites brown, 2nd to 4th tergites each with a pair of yellow patches submedially in male (Fig. 9 B); aedeagus acute apically (Fig. 20 D)................................................................... L. fuscipedes sp. nov.

- Abdominal tergites brown to black, with a yellow patch medially between 2nd to 3rd tergites in male (Fig. 7 E); aedeagus rounded apically (Fig. 13 D).............................................................. .. L. nigroscutellata