I know exactly what you’re thinking, this must surely be a female Dexia rustica….It would certainly be about the right size plus they’re not exactly scarce….So why don’t they have a common name? Well, I could give them a common name on your behalf if you like….Mmm….If it is what you say it is, then its larvae are known to prey on the grubs of the enormous Cockchafer Beetle, Mmm….on second thoughts, perhaps I’d better not!