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The larvae of O. nobilis develop in plant stems or in tunnels bored into wood. Perhaps this is a larva which is mature enough to have emerged into the open.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
We have the 14-Spot. We had a pair mating very close by in May: "Ladybirds mating on Red Campion" -to iSpot 21st May 2013. So that looks consistent. Perhaps I should check out Hogweed stems for Oedemera larvae in due course.
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707