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Ok, I'll put it down as Tachina cf. casta so. Unless I am labelling that incorrectly.

My list for the Italian mainland is below, could be inaccurate I suppose but I am guessing corsicana is endemic to Corsica ?

Tachina casta (Rondani, 1859)
Tachina fera (Linnaeus, 1761)
Tachina grossa (Linnaeus, 1758)
Tachina lurida (Fabricius, 1781)
Tachina magna (Giglio-Tos, 1890)
Tachina magnicornis (Zetterstedt, 1844)
Tachina nigrohirta (Stein, 1924)
Tachina nupta (Rondani, 1859)
Tachina praeceps Meigen, 1824
Tachina ursina Meigen, 1824

source. http://www.faunaeur.org/species_list.php

Thanks for the help Theo/Christoophe