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Originally Posted by Jason Green  Thanks for the update Janet 
So... a bit of splitting and clumping has been happening then! It seems as though perhaps we have both been thinking of the same fly, but I've heard of it being a Lauxaniid and you a Heleomyzid maybe? Not sure. The size I don't think is so essential as to rule out an entire genus if we can't get it to species, or even family for sure as yet! Fly Sapromyza Photos, Fly Sapromyza Images | Photobank NaturePhoto-CZ |
I wouldn't trust any pics other than those on diptera.info Jason, unless I am fairly sure the site is good at making valid IDs.
I hadn't any particular fly in mind, there are too many and I would recognise some by the pattern on the wings but this did look very much like the pic on diptera.info. However, read the update on there and you might get the picture.
I'm hoping I get a response from someone else who knows more about the 'old world' flies.