These buggers have decided to invade my apartment. They've snuck into the space that is in between the skylight glass and the plastic coverings that mute the sunlight (the skylight is diagonal glass that is over my balcony sliding door). It's happened three times so far. Once last weekend, yesterday, and then today. Here's the progression- it's strange because it's almost like clockwork: At around 11:30 am, they start entering into the space and flying around, constantly hitting the plastic. They do this for around 30 minutes. Then, slowly, they crawl out from under the plastic into my apartment. They stay on the wall below the skylight. And then, I vacuum them up My guess is that the space seems like a good place to them at around 11:30 am, but then the sun hits it and it heats up, causes them to want to get out. I sprayed Raid each time- it kills them, but clearly doesn't keep them from coming back another day. Today I looked closer on the outside and noticed that there are little ventilation holes (no ventilation holes around the windows in Toronto!) every 8 inches that lead into the space, so I plugged them all up with putty. This is where they were getting in. So can anyone identify these little F'ers?