Maikäfer Flieg is an old German nursery rhyme - you can listen to the tune as midi file. The text is very dark, it translates to
father is at war,
mother is in Pomerania,
Pomerania has burned down,
and is thought to go back to the times of the 30 Years' War, when large parts of Germany were completely devastated and Pomerania, then associated with Poland, lost two thirds of its population. No idea why the cockchafer, or maybug, is associated with this misery.
The maybug feeds mainly on broad-leafed trees, and its larvae, the chafer grubs, especially like the roots of trees. The larvae develop in the ground for the long time span of three to five years, and the bugs work their way to the surface around end of April, beginning of May. The bugs parading in the photos were attracted by the light in the kitchen of Stefan's mother last Saturday night.
The long development period favours the occurrence of the maybugs in cycles, and so, they can be quite a nuisance to forestry and agriculture. Massive use of pesticides had the consequence that they became very rare in the 1970s/80s. But this year, there seem to be again quite a lot of them around - Maikäfer flieg!