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Many thanks Libor. You are correct for sure, and with your lead, I now I think i know the species. It seems perfect for Akis bacarozzo which is recorded in Corsica. Lots of good images and descriptions on the web eg. http://www.insecte.org/forum/viewtopic.php?f=1&t=715

I think the other one may be a Blaps sp. Possibly Blaps gibba for which i have now found Corsican records and similar looking images.