These were spotted in Hungary on the stump of a tree. The adult was about 2mm long. Is it a box elder bug? I took the photo mainly because, upside down, it looks like a very scary African mask!
These Hemipterans are commonly called Firebugs. Firebugs, Pyrrhocoris apterus, are in the family Pyrrhocoridae. Boxelder Bugs are in the Scentless Plant Bugs Family Rhopalidae.