Hello! According to the distribution maps of orthoptera.speciesfile.org the possible species for that zone are three:

M. martinicum: http://orthoptera.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1136353

M. decoratum: http://orthoptera.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1136357

M. incarnatum (synonymous with M. triangulatum): http://orthoptera.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1136415

There are some images of each one in the links. I recommend you ask in the facebook group "Entomology": https://www.facebook.com/groups/TheEntomologyGroup/?fref=ts

Maybe they can help you there...