last thursday here in Concord NH, I found some new trails to run on. After about 30 seconds they were landing on my head. I ran and ran for an hour and a half(I wanted to learn the route, and thought I could outrun them) and when I looked up, there were about 25 of them around my head, and just bouncing off my head. I kept waving my arms, and the trail map around my head for the entire 90 minutes. I have NEVER seen anything like this. Monday I went back and ran with a mosquito headnet on. It wasn't so bad at all this way, though you can't see as good thru the netting, especially if you get sun glare. A couple times they got inside the netting, and i squished em while i ran. Another couple bit my scalp thru the netting when It was against my head flush. When I got back to the car, I realized there were about 20(!) inside the netting, though for some reason they didn't seem to have bitten me. I think they stayed on the netting. This is a bit crazy, I wonder what caused so many of them. Usually when I trail run, I don't bother with bug spray, because mosquitoes and black flies don't chase me.