I generally don't have too many problems with bugs. If they are light i just deal with them till i go to sleep and will just put my head into my bad. I they are really heavy I will generally find some cat-tails to burn in a small fire and that thins them out.

In the cases that neither on of those work and I am very desperate to get away from them I just take the trek poles out and let the tarp lay on top of me.