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You are welcome Pavel ;) Martin the difference between violaceus and proscarabaeus is just in the thorax and the photo is not that good that you can say which one it is, "Violet Oil Beetle and Black Oil Beetle are almost identical, rarely seem to keep still, and, when seen in bright sunlight, have the key identifying features of their thoraxes often obscured in either deep shadow or glare." http://www.wildlifeinsight.com/Insight/?p=5846 But apart from this, I wouldn't say is either proscarabaeus or violaceus.....

Meloe sp. http://www.zin.ru/ANIMALIA/COLEOPTERA/eng/atl_me.htm