Cybister tripunctatus

imago
Cybister tripunctatus
Cybister tripunctatus

We Japanese call them kokgatano. They length 24-29mm and are hardly in Mainland but much only in Southwest-Islands of Japan. Ofcourse I haven't even seen wild. they look like lewisianus, but it will be easy to distinguish if you got used to see.

larva
Larva
Cybister tripunctatus
pupa
Pupa
Cybister tripunctatus