Mimic double

I have been clearing some small trees and today I was collecting the cut logs and when I picked a piece up I though at first glance there was a spider on the bark.

 Quickly recognised that it was in fact a beetle (species not identified) likely to be one of the bark beetles that lay their eggs on fallen trees, for the larvae to feed on the decaying bark and timber. It was quite still, but when disturbed it moved in a way that resembled one of the wasp species that are quite common around here. I found more of them on the logs and noticed that  when they move around their yellow antennae look and flick the same as the wasp's.