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Hello, Chas!

This is Scatophaga, but no stercoraria (no dark antennae). Could be S. suilla, but better wait for the experts.

I had a similar fly some days ago:

http://www.dipter...ad_id=4951 (first one).

Unfortunately this posting has not been replied on, yet (I'm still interested, if the third fly and couple is S. furcata, thanks!).