The caterpillar will pupate 15 to 40 cm (5.9 to 15.7 in) deep in the ground. The chrysalis is a shiny brown. It is 7.5 to 8 cm (2.9 to 3.1 in) long. If attacked, the chrysalis can move. The chrysalis hibernates. However, "A. Atropos" will sometimes hibernate as a caterpillar. "A. Atropos" does not live through the winter in Europe.