| The skin of prepupa fattens and hardens into a seed-like dark case as the prepupa transforms to the pupa and drops to the ground on vegetation or snow. |
| The prepupa and pupa developed more rapidly on snap bean than on the other 3 leguminous vegetables. |
| The worms then burrow into the soil and form an earthen cell, entering the prepupa stage, which overwinters. |
| During May the larvae transform to prepupa and then to pupa stages, the adult beetles emerging in June or July. |
