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Hi Juergen.
1. I think 1,2 and 3,4 - two different flies.
2. Accorning my key 3,4 fits with Ph. rufiventris - 1ac presut, antennae yellow/black. But as I wrote in:
http://www.diptera.info/forum/viewthread.php?forum_id=5&thread_id=4501&pid=20044#post_20044
currently I have doubts in my key.
Nikita