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I am not an expert. I cannot find a match for this with the material in my collection.
I've looked at most of the species but I am missing material for the amentaria-group.
Hopefully you've made photos of the fly or you still have the body for review.
You can try to key it to a group using the keys from Knut Rognes (page 234-235):

http://www.knut-rognes.no/Rognes%201992b%20-%20Revision%20of%20Pollenia%20venturii%20species%20group.pdf

I've added an attachment from your photo (I have no intentions to violate your copyright. I've only added an arrow to the area of interest.)

Notice the serrated edge in the attachment. Be sure that you have a Pollenia species. If yes, then try the amentaria-group.