Prison bug

What funny name we people gave them; and they're not aware its bearing.

I found them in a sunny field of weeds... all like written down in Wikipedia: 
"This species occurs in large parts of southern Europe and parts of western Europe, including Belgium and the Netherlands. The pyjama shield bug lives on various umbelliferous plants and can often be found on the flower heads of wild carrot, parsnip, angelica and ground elder. It is a typical tree bug that does not often come to the ground and is most often found in rough, usually dry and sunlit herb vegetation and grasslands."