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Hi Sarah -
Have a look at these pictures of an Anthomyia female - http://www.dipter...#post_4330, then look at these ones of Limnophora -
http://www.dipter...post_11001 and
http://www.dipter...post_12490.
The markings are different, but look more at the overall shape and stance of these flies. Even if you can't see the venation or bristles, it's still possible to tell them apart. :)