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Thanks atylotus! And the first thoracic segment is in some cases important, too. Most probably we see Zabrachia tenella here. Compare BEUK, P. L. TH., 1990. THE OCCURRENCE OF ZABRACHIA TENELLA IN THE NETHERLANDS (DIPTERA: STRATIOMYIDAE). - ENT. BER., AMST. 50 (8): 101-106.

Greetings, Eric