We found a few of these tiny jewel beetles (tamamushi) on some leaves. They have white undulating lines across the elytra (hence the latin name “quadriundulatus”).

Coraebus quadriundulatusCoraebus quadriundulatusCoraebus quadriundulatus

Coleoptera: Buprestidae (jewel beetles)
Coraebus quadriundulatus = shiroobi-nakaboso-tamamushi

Location: Near Munakata Common
Google map: here