European Elm Bark Beetle

Thanks Martin.. Great information.. :)

This is a bark beetle that lays eggs in the central track. The grubs hatch and each eat their own tracks under the bark, expanding in thickness as the grub grows. http://crawford.tardigrade.net/bugs/Bugo...

Thanks Maria and Cindy.. I would say some kind of eucalyptus ...

Nice spotting! What type of wood is it?

that is mysterious!