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Hi Calilasseia,

By putting them in the fridge. Not long enough to kiill them, but long enough to stun them. The difference in time can be huge. Some flies die after a couple of minutes. Other can go in for almost an hour. Some recuperate very quickly, others take more then ten minutes to come fully round. blaauw7, a regular here on d.inf, uses this technique and taught me what I know.
On the Dutch site waarneming.nl you can see more of his works. This is one nice Psychodidae: https://waarneming.nl/waarneming/view/143606545?_popup=1

Kind regards,

Ectemnius