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Hi Robert

Good call ! It is, indeed, a Tachinid, though often mistaken for a Sarcophagidae because of the slender abdomen.
This is Phorocera assimilis, a common species in deciduous forests, typically in may. Even more common is its smaller brother, Ph. obscura.
Both Phorocera's have in the male sexe the genitalia hugely enlarged, easy to see.

Theo Zeegers