They are related to the fly. We put up those fly tapes that you hang up. We just use it in our back door area. But with it being wet and humid that is what they enjoy the most. The good thing, they are only around for a couple of weeks. So hang in there.. in the mean time.. pick up some of those fly tapes where you have your morning coffee
Here is a link.. it does explain they don't do US harm.. they are just a pain. Not to mention very bad for our cars paint!
http://www.floridaenvironment.com/programs/fe00508.htm
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