Key to species of the genus Processina

1. Crown dark brown with small pale yellow-white stripes on anterior margin; forewing dark brown with distinct yellow or white patches (Figs. 16–18)....................................................................... P. sexmaculata

- Crown with yellow areas more extensive or completely black; forewing without patches, membrane color uniform, veins sometimes contrasting yellow........................................................................... 2

2. Crown and face completely black............................................................... P. nigroscens

- Crown and face yellow, or incompletely black............................................................... 3

3. Crown with three thin longitudinal stripes extended posterad across pronotum to mesonotum, without large black medial spot (Figs.1–4, 11–12, 22–33)................................................................ P. chandrai sp. nov.

- Crown without longitudinal stripes, with large black spot medially............................................... 4

4. Frontoclypeus with dark brown longitudinal band medially (Figs. 5–8, 13–14, 34–44)............. P. topoarmata sp. nov.

- Frontoclypeus without dark brown longitudinal band medially.................................................. 5

5. Anterior margin of crown without black spots.................................................... P. dashahensis

- Anterior margin of crown with one or two black spots......................................................... 6

6. Anterior margin of crown with one black spot (Figs. 9–10, 15, 45–50)...................... P. kamphaengensis sp. nov.

- Anterior margin of crown with two black spots.............................................................. 7

7. Abdominal venter brown, male pygofer process branched............................................ P. taiwanana

- Abdominal venter yellow, male pygofer process unbranched (Figs. 19–21)............................... P. ruiliensis