Key to species of the genus Magadha

1. Head, pronotum, mesonotum and tegulae with numerous ivory-white to tawny dots................................. 2

- Not as above......................................................................................... 7

2. Central area of mesonotum with 1 large dark brown marking................................................... 3

- Central area of mesonotum without such marking............................................................ 5

3. Frons with 5 pale yellow spots along lateral margin (Wang, 1989: Fig. 5).......................... M. guangzhouensis

- Frons without such spots along lateral margin............................................................... 4

4. Body small; gena with pale yellow dots only; costal margin of forewing with 8 small dark markings (Chou & Wang, 1985: Figs 7–9)................................................................................ .. M. guangdongensis

- Body large; gena with 1 pale yellow transverse band below antennae; costal margin of forewing without marking (Wang, Huang & Wang, 1993: Fig. 7: A–C)........................................................... M. gyirongensis

5. Forewing brown, with numerous ivory-white to tawny dots (Figs 17–20, 24).................. M. densimaculosa sp. nov.

- Forewing greyish white, with different sized brown to dark brown markings....................................... 6

6. Forewing with 1 broad dark brown marking across base (Figs 1–4, 8); phallobase with lateroapical margin rolled-up dorsad in dorsal view (Fig. 15)............................................................... M. basimaculata sp. nov.

- Forewing without marking at base; phallobase without lateroapical margin rolled-up dorsad in dorsal view (Chen et al., 1989: Fig. 14: D, J)................................................................................ M. formosana

7. Disk of vertex with w-shaped black marking (Chou & Wang, 1985: Fig. 11)............................ M. w-maculata

- Disk of vertex not as above.............................................................................. 8

8. Mesonotum with anterior third pale yellow brown and posterior two-thirds dark brown between lateral carinae........... 9

- Mesonotum not as above..............................................................................12

9. Posterior margin of frons with a broad and transverse dark brown band........................................... 10

- Posterior margin of frons without band.................................................................... 11

10. Width of vertex at base almost as wide as long in midline; forewing greyish brown, with numerous dark spots (Wang & Huang, 1995: Figs a, b)................................................................................ M. yangia

- Width of vertex at base about twice as wide as long in midline; forewing fuscous, with basal two-thirds with irregular dark markings (Figs 83–86, 90)................................................................ M. taibaishanensis

11. Vertex and mesonotum brown, pronotum pale brown; frons with one foliar greyish white marking near middle, one greyish white band across base; clypeus with one large and small roundish, greyish white marking (Wang, Huang & Wang, 1993: Fig. 6: A–C).................................................................................. M. yadongensis

- Vertex, pronotum and mesonotum ochraceous; frons and clypeus brown, with numerous yellowish brown dots (Distant, 1906: Fig. 138)................................................................................... M. flavisigna

12. Head and thorax piceous, forewing fuliginous and opaque, with numerous minute ochraceous spots, apical marginal veins dis- tinctly pale creamy-white (Distant, 1906).......................................................... M. nebulosa

- Head, thorax and forewing not as above................................................................... 13

13. Frons with at least 6 spots along lateral margin.............................................................. 15

- Frons without spots along lateral margin.................................................................. 14

14. Vertex at base 3 times as wide as long in midline; mesonotum with anterior half yellowish brown and posterior half dark brown (Fennah, 1956).............................................................................. .. M. fennahi

- Width of vertex at base twice as wide as long in midline; mesonotum pale yellow and with anterior third dark brown (Chen et al., 1989: Fig. 18: A).................................................................... .. M. semitransversa

15. Head and thorax mainly ochraceous; frons with 6 spots along lateral margin....................................... 16

- Head and thorax not as above; frons with 7 spots along lateral margin............................................ 17

16. Anal segment of male in dorsal view with lateroapical angles decurved and produced into a stout spine; medioventral process of pygofer broad and its lateroapical angles produced into short lobes, distally incurved (Fennah, 1956: Fig. 15: A–B).................................................................................................. .. M. cervina

- Anal segment of male in dorsal view relatively large, apex 1.5 times wider than base; posterior margin of the medioventral pro- cess of pygofer round (Chen et al., 1989: Fig. 19: F, H).............................................. M. eusordida

17. Mesonotum with anterior third dark brown and posterior two-thirds ivory-white (Chen et al., 1989: Fig. 15: A)... M. redunca

- Mesonotum not as above............................................................................... 18

18. Forewing ivory-white, with one large subtriangular dark brown marking near base, anterior margin of forewing with 8 small dark brown markings (Chou & Wang, 1985: Fig. 3)............................................... M. wuyishanana

- Forewing not as above................................................................................. 19

19. Frons with 7 dark brown spots along lateral margin; clypeus with one longitudinal dark brown band between lateral and median carina; forewing with 10 small and 2 large brown markings along anterior margin (Chou & Wang, 1985: Figs 4, 6).......................................................................................... M. shaanxiensis

- Frons with 7 ivory-yellow spots along lateral margin; clypeus and forewing not as above............................ 20

20. Frons with one diffuse transverse pale yellow bar across middle; mesonotum dark brown, with lateral angles ivory-yellow (Fennah, 1956)........................................................................... M. metasequoiae

- Frons with one transverse pale yellow bar across base and one large ivory-white marking near apex of median carina; apical two-thirds part of mesonotum between lateral carinae with ivory-white dots...................................... 21

21. Anal segment of male in dorsal view with lateroapical margin not concave; phallobase, in dorsal view, dorsal lobe of phallobase with 2 large and 2 small processes in the middle, in ventral view with ventral lobe with apical margin slightly incised in the middle (Figs 55, 60, 64–65).................................................................. M. pinnata

- Anal segment of male in dorsal view with lateroapical margin concave; phallobase in dorsal view with dorsal lobe with 2 small processes near the middle, in ventral view with ventral lobe with apical margin deeply cleft in the middle (Figs 37, 42, 47–48)................................................................................ M. intumescentia sp. nov.