Common cockchafer
stages: egg, three larval instars, a pupal instar and the adult beetle. The adult beetle is 25 to 30 mm long, with a dark head, black pronotum covered with [...] years for the larvae to fully develop. The grubs are 10 to 20 mm in the first autumn, 30 to 35 mm by the following autumn, and 40 to 46 mm in the spring of [...] larvae (grubs) have a whitish curved body, large head, with strong mandibles and long, hairy, well developed yellow legs. It takes three or four years