Tiger Fly
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This is a tiger fly taking a break from hunting gnats to clean its legs. Years ago I kept several jumping spiders in terrariums on my desk, and I got quite good at catching tiger flies.
Here’s how you do it: Get a clear plastic cup and hold it over the fly so that sunlight falls on the fly through the cup. This defeats the fly’s ability to see the cup and identify it as a threat. Gently lower the cup over the fly. When you are about an inch away from covering the fly, it will be able to see the sides of the cup coming down, and it will take off in the only direction it thinks is safe: towards the sun. The fly will actually fly up into your cup. Quickly drop the cup the rest of the way, slip an envelope under it and you have a neatly trapped fly.
The interesting thing is that tiger flies will panic for a few seconds and then calm down, and as long as you keep the open end of the cup pointed away from the sun, the fly will probably stay in the cup even if you remove the covering envelope. I once caught nine tiger flies in one cup using this method.
Tiger flies are aggressive and carnivorous, however. The flies began attacking each other immediately, and by the time I got back inside, there were only two survivors, sitting on opposite sides of the cup happily eating the dead.