On May 28, 2010, saya from Heerlen Netherlands (Zone 8b) wrote:
This is a somewhat rarely seen bug in my region. I don't know how it came in my yard. The Dutch common name for it is 'gouden tor' translated 'golden beetle'. It is considered as the most beautiful beetle we have in Europe. And beautiful it is! I've read that they feed on flowers, nectar and pollen, in particular roses (from where they get their name); which is where they can be found on warm sunny days, between May and June/July, occasionally to September. 'Golden Beetles' are found over southern and central Europe and the southern part of the UK where they seem to be sometimes very localized. Their larvae are the insect equivalent of earth worms and help make very good compost where they are often found in great numbers. So I think it probably came in my yard because it was in a bag of potting soil that I've stored in my little greenhouse.