Prionocerus

Geiser, Michael, 2010, Studies on Prionoceridae (Coleoptera: Cleroidea). II. A revision of the genus Prionocerus Perty, 1831, Zootaxa 2328, pp. 1-48 : 41

Key to species of Prionocerus

1. Pronotum metallic green. Elytra green with yellow humeral macula. Sumatra ....................................... P. viridiflavus

- Pronotum orange red, rarely with darker discal spot(s). Elytra unicolorous ................................................................ 2

2. Elytra orange yellow or infuscate brownish. Aedeagus as in figs. 2, 9, 16. Widely distributed .................... P. bicolor

- Elytra of metallic green or blue coloration, rarely black .............................................................................................. 3

3. Base of femora and antennae entirely yellow. Aedeagus as in figs. 3, 10, 17. NW-Thailand ............. P. paiensis n. sp.

- Femora entirely dark coloured. Major parts of antennae black .................................................................................... 4

4. Pronotum longer than wide. Elytra very densely, rugosely punctate............................................................................ 5

- Pronotal shape usually broader. Elytral texture finer, not rugose ................................................................................. 6

5. Male antennae very long and massive, surpassing the first third of the elytra. TBL usually larger, 11.2–13.3 mm. Aedeagus as in figs. 6, 13, 20. Indonesia to Central Thailand................................................................. P. opacipennis

- Male antennae much shorter, reaching only the humeral callus of elytra. TBL usually smaller, 10.0–12.0 mm. Aede- agus as in figs. 4, 11, 18. Malaysia............................................................................................... P. malaysiacus n. sp.

6. Lateral lobes of aedeagus flat (fig. 15). Last abdominal segment of male small (fig. 22). Sculpture of elytra not rugose, punctures dense, but usually still separate. Median lobe of aedeagus as in figs. 1 and 8. Widely distributed .. ............................................................................................................................................................. P. coeruleipennis

- Lateral lobes of aedeagus more robust. Last abdominal segment of male very large (figs. 27, 29). Punctures of the elytra confluent, forming a rugose texture .................................................................................................................... 7

7. Antennae broader, more strongly serrate. Aedeagus as in figs. 5, 12, 19. Sumatra ........................ P. championi n. sp.

- Antennae narrower, less strongly serrate. Aedeagus as in figs. 7, 14, 21. Java ................................... P. wittmeri n. sp.