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Hello,

Paul is right, without the the details he mentions a secure identification is not possible. But probability and some experience tell me that is a species of Bradysia. If it is caputured inhouse and at this season (winter in the northern hemisphere) , it is possibly the common house sciarid Bradysia tilicola [formerly B. amoena]. The males a much easier to rcognize by their characteristic gonostyles. So if there were a photo of a male as well, I could probably tell you the species an surely the genus.

Good luck,
Kai