Not an easy one, since the rings are missing, but the closest I found would be Common Ringlet, Coenonympha tullia. Please, verify!!
http://bugguide.net/node/view/3819/bgpage?from=0
http://www.butterfliesandmoths.org/species/coenonympha-tullia
Some European ones...
http://www.ukbutterflies.co.uk/species.php?species=tullia
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