Key to species of Idiocerinae from Malaysia

1. Hind femoral macrosetae 2+0............................................................................2

- Hind femoral macrosetae 2+1............................................................................7

2. Forewing with third apical cell pedunculate ( Balocha)........................................................3

- Forewing without pedunculate apical cell...................................................................4

3. Peduncle three times as long as pedunculate cell.................................................. Balocha lucida

- Peduncle as long as pedunculate cell.......................................................... Balocha bicolor

4. Forewing with 3 subapical cells..........................................................................5

- Forewing with 2 subapical cells..........................................................................6

5. Head and thorax with dense patches brown and yellow (Figs. 5 C–D); subgenital plate without flattened dorsoventrally............................................................................................. Chunra australis

- Head and thorax with brown bands (Wei et al., 2010: figs. 2–3); subgenital plate flattened dorsoventrally (Wei et al., 2010: fig. 26).................................................................................. Kuchingella gigantea

6. Style apical process elongate (Fig. 14 F).................................................. Namiocerus cephalotes

- Style not such above.................................................................... Muinocerus qadirii

7. Lateral frontal sutures absent (Fig. 3 D) ( Busonia)............................................................ 8

- Lateral frontal sutures present (Fig. 7 D)...................................................................10

8. Gonopore with finely serrate margin (Xue & Zhang, 2015b: figs. 5D–E).............................. Busonia serrata

- Gonopore without serrate margin (Figs. 11 D–E).............................................................9

9. Crown brown; aedeagus not tapering apically in lateral view (Fig. 11 D)............................. Busonia amentata

- Crown yellow; aedeagus tapering apically in lateral view (Fig. 12 D)................................ Busonia apicalis

10. Crown and pronotum with an orange transverse band (Fig. 4 E).............................. Pedioscopus balochoides

- Crown and pronotum without such band.................................................................. 11

11. Aedeagal shaft pustulate (Xue & Zhang, 2015a: figs. 2D–E)................................ Busoniomimus umbellatus

- Aedeagal shaft not pustulate (Figs. 15 D–E)................................................................12

12. Aedeagal shaft ventral margin with pair of long processes basally (Maldonado-Capriles, 1972b: fig. 14).................................................................................................. .. Brachylorus leucoclavus

- Aedeagal shaft without such process.....................................................................13

13. Aedeagus with 2 pairs of processes (Khatri & Webb, 2014: figs. 4D, 5E) ( Idioscopus).............................. 14

- Aedeagus without process..............................................................................15

14. Forewing with third subapical cell (Khatri & Webb, 2014: fig. 4B)................................ Idioscopus nitidulus

- Forewing without third subapical cell (Khatri & Webb, 2014: fig. 5B)............................. Idioscopus clypealis

15. Style with dense setae on dorsal margin (Fig. 10 F).................................. Burmascopus longidens sp. nov.

- Style without setae on dorsal margin (Fig. 16 G).............................................................16

16. Aedeagal shaft with lateral margin serrate in apical half (Figs. 16 E–F).............. Serridiocerus membranaceus sp. nov.

- Aedeagal shaft with lateral margin smooth (Figs. 15 D–E)............................................................. Philipposcopus maquilingensis