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Hi Gert,

if I see it right, the hair tufts are located at the base of the abdominal tergits - this indicates Lasioglossum sp. (a female). Although the furrow on tergite 6 is not visible, the overall appearance fits well to a halictid bee.
Alike Halictus, species level is hard to ID via photo in this genus, especially these smaller ones.

BR, Marc