A Wood Wasp, also known as a "parasitic wood wasp" or "horntail", is a mostly harmless flying insect, about 23 mm long, common for example in the United Kingdom. They are named for their habit of feeding on dead wood. The female has a tube at the back of her body which gives her a dangerous look, but it is an ovipositor.
They belong to families Xiphydriidae , Orussidae , Syntexidae or Xyeloidea of the order hymenoptera.
External links
A description with photo.