After feeding for a few months, the larvae go into dormancy while covered in ground matter. In spring, the larvae resume feeding and pupate. By June or July, adults emerge, all from the same generation that was laid in the previous fall.
After nourishment for a few months, the larvae enter torpor while enveloped in soil debris. In spring, the larvae resume feeding and undergo metamorphosis. By June or July, adults emerge, all from the same brood that was laid in the preceding autumn.