Lucidota atra is a day-flying firefly that glows as a larva -- and as a pupa, obviously! -- but not as an adult. (Don't ask my why! What is is glowing for, if not in order to find a mate?) Found it in decaying leaves while gardening. Looks pretty far along, & in fact I observed adults in the area the following day.

8.7 mm long (measured in this position, not uncurled).