Lightly spray the pupae twice daily, but do not saturate as mould could form inside and kill the pupae.
If you are nearing autumn and it is unlikely you will be able to raise a second brood then the adults can be used as "SET" specimens, or the pupae can be put into winter hibernation and brought out in spring for hatching.
This hibernation period is called diapause.
Hibernating pupae can be laid in plastic boxes with cotton wool for padding and housed in the refrigerator.