Byrsax spiniceps
Byrsax spiniceps is a species of beetle in the subfamily Tenebrioninae, and the tribe Bolitophagini.
It was first described in 1894 by George Lewis.
GBIF lists Byrsax kimurai as a synonym. However Korean authorities regard these two species as distinct.
It is observed in all seasons except winter, but mainly in spring and summer, on various mushrooms.
It is native to Korea, and to Japan.