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Hello

Is it possible to confirm the ID of this fly found yesterday in a calcareous grassland ?
Basicosta are whitish, each mid tibia has 2 ad. Is the frons narrow enough to exclure species as L. regalis ?
This fly is much smaller than the usual Lucilia sericata that I find on flowers.

Saint-Clair-sur-Epte, Val d'Oise, Île-de-France, France
24th of August 2020
Length : 5 mm