When you have the workers, give both the queen tube and the worker tube adjacent access to each other in an escape-proof outworld/foraging space. I find that the choice of access to the host workers is sometimes safer for the queen than forcing both parties into a closed space withing the fridge, as is the common approach to an introduction.
Keep in mind that Lasius use formic acid in defense, so the workers should be collected in a spacious container, so as not to gas themselves.
My first queen was also a social parasite.
Edited by Batspiderfish, July 13 2016 - 3:15 AM.
If you've enjoyed using my expertise and identifications, please do not create undue ecological risk by releasing your ants. The environment which we keep our pet insects is alien and oftentimes unsanitary, so ensure that wild populations stay safe by giving your ants the best care you can manage for the rest of their lives, as we must do with any other pet.
Exotic ants are for those who think that vibrant diversity is something you need to pay money to see. It is illegal to transport live ants across state lines.
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Black lives still matter.