What is this stinging insect?

Question

I already asked this, but I asked in the wrong section. My friend was stung by one of these nasty things and had his knee swollen for nearly a month. It lives primarily in the woods. It has a dart or arrow-shaped stinger on it. It is often seen with it's stinger buried into the barks of trees. We call them timberflies around here, but I know it's not the proper name. Is it a type of wasp?

Answer 1

I think that it is a Ichneumon wasp and that thing in the bark is it's ovipositor, what it lays it's eggs with.

Answer 2

Learn to ID them, here -

http://bugguide.net/node/view/15740

http://greennature.com/article1899.html

http://www.einsteins-emporium.com/life/a...

http://www.whatsthatbug.com/

http://www.insectimages.org/