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poor drawings
If the posterior border of the basal platelet has a median expansion and the body is not hairy (see my photo of filicornis in the gallery http://www.dipter...to_id=5496 and the photo of amphibia in the other message) than it must be amphibia. But this is not the case in your specimen. Furthermore I still can see a lateral stripe (see also my photo of an aestivalis specimen in this message). You can check this if this is true for your specimen. If not, than it is something else (including autumnalis).