Answers:
They are small biting insects - "no see Ums"

http://pelotes.jea.com/animalfact/arthro...

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Yes, no-see-ums, nasty little suckers. You grain this little stinging feeling and you can hardly see them. About 1 day following little red welts come up where on earth they've bit you. I had roughly 120 bites on one leg from them. Oh, and bug repellent doesn't help, the simply repellent that works is the wind.

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