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The attached was photographed on 12/07/06 in South East England.

I appologise for the quality , but I thought the markings might be sufficient for an identification to at least the family. It was feeding on what I believe to be hemlock (Oenanthe crocata) growing in the middle of a shallow pond. (My wife won't let me paddle in muddy ponds to get close to flies)

I thought it may be a Stratiomys Sp.

Thanks

Gordon