
These bugs showed up early in the morning on the Fourth of July at Sturgeon Lake and quickly died off. But for the few hours they existed, they made quite a mess. They are small enough to go right through screens. We swept thousands of them off the floor.

Crabs.
Nanobots.
It is difficult to tell by your photos, but they might be ceratopogonidae or biting midges- sometimes referred to as Noseeums. https://en.wikipedia.org/wiki/Ceratopogonidae
Again, just a guess…
wood gnats?
My vote is with TimK…some type of midge. I think it’s a water midge, though.
What’s That Bug?
My vote is with Tamara- probably a water midge. I base this conclusion on Paul not having described a day of blood-feasting horror.
There was no biting, so yeah, I suppose it could have been water midges. The little buggers were so small it’s hard to tell.
What made it so strange is that it was a one-night phenomena. They suddenly showed up in great numbers, and then were totally gone the next night.
Mayflies.
Definitely Mayflies – we’ve had the same scenario at our cabin. They will pile up by anything left lit up overnight.
Here’s a shot of the window sill, loaded with casualties.
It kind of looks like there are a variety of bugs there, but the tiny things resembling flies outnumber the random other stuff by a lot.
Ishy. That’s my vote.
I am going to barf
Definitely, midges. They wrecked havoc on a ball game we were watching.
Bugs disrupt Yankees-Indians in late innings
Crotch crickets.