Key to Oriental Nitela (modified from Li & Li 2010)

(Males of N. apoensis Tsuneki, N. protuberancis Li & Li, N. bicornis Williams, N. williamsi Menke, and N. domestica Williams are unknown).

1. Setae on lower frons and clypeus golden................................................................... 2

- Setae on lower frons and clypeus silvery (except setae on clypeus golden in males of N. pseudocollaris & N. neoapoensis). 3

2. Scutellum without median transverse protuberance. Sri Lanka ............................... N. henrici Turner, 1926

- Scutellum with median transverse protuberance (See Figure 3 of Li & Li 2010). China ..... N. protuberancis Li & Li, 2010

3. Antero-lateral angle of pronotum acutely pointed or pronotum approximately rectangular (Figs. 4, 12 & 35)............. 4

- Antero-lateral angle of pronotum not acutely pointed, or pronotum approximately rounded (Figs 19 & 27)............... 9

4. Mesoscutum transversely or irregularly transversely ridged (Figs 4, 12, 46 & 54)................................... 5

- Mesoscutum reticulate (Figs 35 & 40)..................................................................... 7

5. Mesoscutal ridges irregularly transverse (Figs 46 & 54). India ...... N. pseudocollaris Mawadda & Girish Kumar, sp. nov.

- Mesoscutal ridges distinctly transverse (Figs 4 & 12)......................................................... 6

6. Pronotum with broad transverse groove, anterior angles rectangular, anterior margin conspicuously raised (Fig. 12). China; India; Malaysia; Sri Lanka ........................................................... N. collaris Turner, 1926

- Pronotum only posteromedially depressed, anterior angles not rectangular, anterior margin not raised. Philippines ........................................................................................ N. bicornis Williams, 1928

7. Posterior declivity of propodeum nearly straight; in female, clypeus tridentate anteromedially. Philippines ............................................................................................... N. rugosa Williams, 1928

- Posterior declivity of propodeum with heart shaped structure (Figs 36 & 40); in female, clypeus approximately quadridentate anteromedially (Figs 34 & 42)........................................................................... 8

8. Mesoscutum conspicuously coarsely reticulate (Fig. 35); propodeal dorsum longitudinally striatorugose (Fig. 35); in male, setae on clypeus golden. India .................................. N. neoapoensis Mawadda, Girish Kumar sp. nov.

- Mesoscutum inconspicuously reticulate (Fig. 40); propodeal dorsum longitudinally ridged, not striatorugose; male unknown. Philippines ..................................................................... N. apoensis Tsuneki, 1992

9. Frons with bifurcate carina (Fig. 17)..................................................................... 10

- Frons without bifurcate carina (Fig. 25)................................................................... 11

10. Dorsal arms of frontal carina long, parallel, extending nearly up to anterior ocellus; eyes glabrous; carina delimiting posterior surface of propodeum dipping down medio dorsally suggesting the top of heart shaped structure; recurrent vein of forewing with stub of vein just before its juncture with submarginal cell (See Figure 1 of Menke 1968). Malaysia ................................................................................................. N. williamsi Menke, 1968

- Dorsal arms of frontal carina short, unparallel, extending nearly up to half distance to anterior ocellus (Fig. 17); eyes with short, sparse pubescence; carina delimiting posterior surface of propodeum straight (Fig. 20); recurrent vein of forewing without stub of vein near juncture with submarginal cell (Fig. 22). China; India (present study); Japan; Philippines; Taiwan ........................................................................................ N. domestica Williams, 1928

11. Posterior margin of mesoscutum with transverse row of six conspicuous pits. Philippines ..... N. philippinica Tsuneki, 1992

- Posterior margin of mesoscutum with some longitudinal ridges or with a few inconspicuous pits...................... 12

12. Anterior margin of scutellum with short longitudinal ridges or with somewhat inconspicuous pits..................... 13

- Anterior margin of scutellum with transverse row of conspicuous pits........................................... 14

13. Pronotum medially with V-shaped extension and laterally depressed on posterior ridge; ridges on propodeal dorsum scattered and oblique, connected by short and transverse ridges making the surface approximately reticulate. China ......................................................................................... N. obliquipropodea Li &Li, 2010

- Pronotum medially without V-shaped protraction; ridges on propodeal dorsum comparatively denser and longitudinal connected by rather short and inconspicuous transverse ridges, making the surface inconspicuously reticulate. China ..................................................................................... N. yasumatsui taiwana Tsuneki, 1956

14. Mesoscutum and scutellum with transverse ridges. Philippines .......................... N. luzonensis Williams, 1928

- Mesoscutum and scutellum without transverse ridges........................................................ 15

15. Posterior ocellus at least 1.5 × its diameter from eye. Indonesia .............................. N. maxima Maidl, 1925

- Posterior ocellus almost touching eye.................................................................... 16

16. Pronotum with transverse groove, divided in the middle by low carina. Cocos Islands; Malaysia. N. pendleburyi Turner, 1926

- Pronotum without transverse groove, not divided in the middle by carina (Fig. 27). India ............................................................................................. N. nasseri Mawadda, Girish Kumar sp. nov.