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Moscow, park, 18 may, in mass, 7-9mm.
Looks for me as Phorocera obscura from 13may, same city, place in 3-4 km, thread http://www.diptera.info/forum/viewthread.php?forum_id=5&thread_id=1654
I can't find sugnifical difference, but all Tachinidas from 13may was between 5-6mm.
Nikita