Mayflies / Blackflies
I believe the flies we are seeing right now are Mayflies and not Blackflies. Although their huge swarms are a nuisance, they do not eat you alive like Blackflies do. I have never been bitten by a Mayfly but have definitely ingested a few over the years. House painting at this time of year can present some problems, as you wind up with a speckled house. Blackflies do not appear until the end of May, early June and are brutal.
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