Re: Swedish Winter..
Bah! In Alberta and Saskatchewan they have mosquitoes that can easily be mistaken for WWI aeroplanes, and they have them by the bajillions.
About 20 years ago I was in Banff one evening and I went to a local gas station that doubled as the local Starbucks, Dominos, Dunkin' Donuts, McDonalds etc. Lierally. Four or five little counters each branded for the business. I believe it was also the UPS office. I digress.
As I was about to enter I saw an oily gas up in the old-style canopy, illuminated by the klieg lights.
"My god!" I thought. "There's a gas vapor leak!"
Then I remembered that gasoline vapor is heavier than air and noticed a young guy spraying deet along the felt seal on the door.
"Quick, before the mossies get in!" he yelled.
That vapor was a billion mosquitoes illuminated by bright light. As I closed the door I could see a bunch trying to crawl through the door seal. Quite why I hadn't been eaten alive while I was gawping I don't know.
Later, at Miette Hot Springs I saw a carpet of mosquitoes over a swimming pool, driven off by the chlorine gas but drawn by the water. There was a cloud of the things over the entire length and width of the pool.