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Hi Alain,

Again very nice pictures. In my opinion it is save to identify this species as Palloptera trimacula. This species is known to be found on Umbelliferae. Furthermore Parmenter (1951, 1960) raised imagines from puparia found in December under the epidermis of the stalk of Angelica silvestris.

Parmenter, L., 1951. Notes on the Distribution of Pallopteridae in Britain. -- Ent. Record, 63(12): 304-306.
Parmenter, L., 1960. A Further List of the Diptera of Bookham Common. Lond. Nat., 39 (1959): 66-76.

Jan Willem van Zuijlen