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Thank you Nikita.
I see the link to the key above did not work somehow. I will try again below. The key attached takes a regional approach so only considers some of the flies - those known for that region. According to the key some species are not possible to differentiate without much more material, as you suggest. My hope was that this one was actually one that could key out. However I am having difficulty. Anyway I attach a last picture that I have. Cheers, Philip

Key: http://www.fao.org/3/p5178e/P5178E10.htm This fly collected from region 1...