Key to species of Stirellus Osborn & Ball from China

The following species are of uncertain identity and are therefore omitted from the key: S. breviceps, S. projectus, and S. viridicans (see checklist and species entries below for details).

1. Vertex and/or pronotum, mesonotum and scutellum with orange-red to brownish red markings......................... 2

- Vertex, pronotum, mesonotum and scutellum without orange-red to brownish red markings........................... 4

2. Vertex with longitudinal orange-red bands (Fig. 17 A–C)...................................... neospeciosus sp. nov.

- Vertex with transverse band with or without additional spots, orange-red to brownish red............................. 3

3. Anterior margin of head acutely angled (Fig. 15 A).......................................... multipunctatus sp. nov.

- Anterior margin of head rounded (Fig. 22 A–B)..................................................... rubrolineatus

4. Vertex with subapical transverse band or spots (Figs. 11 A, 12B)............................................. indrus

- Vertex without subapical transverse band or spots............................................................. 5

5. Vertex more than twice as long as width between eyes, apex of vertex and underside of body dark brown (Figs. 4 A–E, 5A–E)............................................................................................... capitatus

- Vertex shorter than twice as long as width between eyes, apex of vertex and underside of body not dark brown............ 6

6. Head acutely produced (Figs. 9 A, 20A)..................................................................... 7

- Head not acutely produced............................................................................... 8

7. Style apophysis moderately long (Fig. 10 E)............................................................ grandis

- Style apophysis very long (Fig. 21 D)................................................................ productus

8. Aedeagal shaft short and stout (Fig. 26 I).................................................... translucidus sp. nov.

- Aedeagal shaft elongate................................................................................. 9

9. Vertex evenly rounded (Fig. 7 A)................................................................. daii sp. nov.

- Vertex angularly rounded (Fig. 27 A–E).......................................................... yeongnamensis