In my opinion, the easiest way to find mated Queens is to check around street lights at night. I always find at least one or two -- on humid nights, I can find lots more and some times I can see the mating flights take place. So this is my advice for the newbies here and for the pros as well: if you want to find new Queens, wait for night to come and then check around the street lights! Street lights near woody or grassy areas are best but I find Queens even in the middle of the city some times. If you don't find any on the first night or even the second -- have patience. They will come eventually. This method works and it's much better than digging up established colonies.
Another good method is to check the roof of your car in the morning after the rain. If there's any condensation on the roof you might find a Queen or two trapped in the water. I found 5 tetramorium Queens on the roof of my car this very morning and I saw many more on the other cars around me. The water on your car is like a small lake to the small Queens and they become trapped.
This might sound obvious but here's my final method to finding Queens: just stop and look down! Ants are so small mating flights can be happening all around you and you would not know it! If you stop and look down you'll find Queens waiting to be picked up. Yes, it's THAT easy.








It was terrible.. Nauptials was in night on the street light...


