Sehirus luctuosus, the Forget-me-not Bug, is a burrowing shieldbug belonging to the family Cydnidae. It is found from Europe to Central Asia.In Central Europe it is widespread and not uncommon. They are found in the Alps on sunny slopes up to almost 2000 meters above sea level. Adults are 6.2 to 8.3 millimeters long. They are completely black in colour and only sometimes have a bronze sheen. The second antennal segment (pedicellus) is much paler than the rest.