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Hello,
is this a Brachypalpus, maybe B. valgus?
Found today and yesterday (24-03-2017, 25-03-2017) on Willow (Salix) in the Elbe River floodplains, Lower Saxony (first two photos one individual, photos 3 and 4 another individual).
(there was no comment in the main forum, so I try again here. Additional photos here: https://diptera.i...d_id=78530)
best wishes, Jann