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When I found them, I keyed the two flies key on the following webpage to P. quinquimaculata: http://www.bioima...culata.htm
(using Alan Stubb's unpublished draft key).

But they look different from this:
http://www.dipter...d_id=44829

which has a dark stigma, dark feet, and lacks the infuscated hang-vein.

Grateful for any comments.

Malcolm Storey