Silver-Y Moth

A silver-Y moth, Autographa gamma (Lepidoptera: Noctuidae), so named for the inverted Y- or gamma -shaped white mark on the wings (though I would have thought 'lambda' would have been more apt).  I first saw one of these moths in long grass in the middle of a hot sunny afternoon but was unable to get any clear photos of it.  Five days later, on a more cloudy afternoon I was able to get these photos near the same place.

Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2009-07-08.