[4] In the early stages of its life cycle, Dieunomia triangulifera spends the winter underground as a prepupa in a state of diapause, allowing it to survive harsh conditions.

[4] This prepupa can be distinguished from that of Nomia melanderi by sharper dorsal prominences on the thorax,[4] and is butter-yellow with bands of orange between segments.

[4] For around two to four days after the termination of diapause it makes occasional tiny flexing movements.

[4] It then sheds the prepupal skin, a process that takes from one to six minutes in healthy prepupae.

[4] The newly emerged adult has soft, white wings and must remain, motionless, in the cell for about 2 days in order for them to harden.