Key to species of Processina (males)

1. Forewing with distinct transparent patches...................................................... P. sexmaculata

- Forewing without distinct transparent patches............................................................... 2

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

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

3. Crown with three brown thin longitudinal stripes, without large black spot............................... P. chandrai

- Crown with large black spot medially..................................................................... 4

4. Pygofer process branched............................................................................... 5

- Pygofer process unbranched............................................................................. 6

5. Scutellum yellowish-brown.................................................................. P. dashahensis

- Scutellum brownish black..................................................................... P. taiwanana

6. Aedeagus shaft without a thorn-shaped ventral process.......................................... P. kamphaengensis

- Aedeagus shaft with a thorn-shaped ventral process.......................................................... 7

7. Aedeagus with an unbranched distal process............................................... P. hunanensis sp. nov.

- Aedeagus with a pair of long, thin distal processes........................................................... 8

8. Aedeagus base with a sheetlike process............................................................ P. ruiliensis

- Aedeagus base with thick apodeme, broad in lateral view............................................ P. topoarmata