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From the UKMoths site:
"The principal distinguishing feature is the arrangement of the postmedian markings on the forewing.
On P. aurata the only consistent postmedian mark is a round golden blotch near the costa, but there is usually a small golden mark between it and the costa. In fresh specimens, there is sometimes a thin indistinct wavy golden postmedian line between the round blotch and the dorsum.
On P. purpuralis the postmedian markings can form a continuous broad band, but it is usually broken into three substantial marks. The mark near the dorsum is always much more substantial than that, if any, on P. aurata, and turns towards the base of the wing as it approaches the dorsal edge."
There isn't much marking towards the dorsum on your specimen (lovely photo!) but what there is turns towards the base of the wing. Tricky!
Hi, moths aren't really my thing but I like photographing them, from my guide Pyrausta purpuralis seems to have more extensive yellow / gold markings across the wings.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.2, -1.0
OS grid ref: SU7451