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If you want to check on names of flies in the British fauna, use http://www.dipter...search.php. Just type in the genus or species name, and you should get an answer. But remember that the ending can change, depending on the gender of the genus, so Laphria marginata has become Choerades marginatus. If you type in "marginat" the search facility will return both marginata and marginatus (as well as immarginatus).