false bombardier beetle because of the black head (I think), The ones with the orange head is the one you maybe wanna stay away from.
I sent it to the Smithsonian Dept of Entymology who concluded it appears to be a... Bombardier beetle. Spitz wins the prize!
This bug is nothing to worry about. Now imagine if it was the Sydney funnel web spider; then you'd have a problem but then again you don't live duwn unda.