|MadSci Network: Zoology|
I consulted with Ted Sawinski for the following answer to your question:
"You could be describing either the larvae of Lampyridae (Lightning bug or Fireflies), or Phengodidae (Glowworms), or simply adult females. In NA Phengodidae, all adult females (25 species) are wingless, while in Lampyridae most of the females of 125 species are wingless & look very much like larvae. The wingless Lampyrid females & most Lampyrid larvae are luminescent. Most Lampyrids occur in the east & the south of North America. In Phengodids all females are wingless & luminescent. Notably, the larvae are predaceous."
All of this info was gleaned from "An Introduction to the Study of Insects", 6th ed., Borror, Triplehorn, Johnson." Ted Sawinski, Entomologist, Agriculture Canada London, Ontario
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