Saw these just yesterday. Vacuumed up 11 of them. It had been raining all day and was rather chilly. Not all survived.
The last ones I caught were earlier in the summer, normally just after a rain, but sometimes not. First one I saw hanging out near the colony entrance I nearly dived on...only later to find that around some colonies there were several hanging out. And if I aggitated the workers sufficiently, they seemed to be moving the winged ones to different chambers/tunnels, or forcing them to the surface because so many workers were trying to come up and attack.

OK, so "queens" or males?

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"A man that should call everything by it's right name, would hardly pass the streets without being knocked down as a common enemy." The Complete Works of George Savile, First Marquess of Halifax 1912,246