Female Oviposition Techniques > Brown Bag

Some species of butterflies overwinter as unfed first instars or eggs. Females from these species groups which include greater fritillaries, arctics, alpines (and other satyrs), lesser fritillaries, parnassians, and some giant skippers will lay their eggs haphazardly near host plants as hatchling larvae will not initiate feeding until next spring.

That being the case, you can set up these females in brown bags with dead host and they will lay eggs either on dead host or on the bag itself facilitating the process of getting eggs. These females do not necessarily need a lot of light to trigger oviposition. For example, placing a live fritillary female with dead violets and a nectar source oftentimes works well.