Railroad Worm (genus Phrixothrix)
A Railroad Worm is a larva or larviform female adult of a beetle of the genus Phrixothrix in the family Phengodidae, characterized by their unique possession of two different colors of bioluminescence. The luminescent organs of their body can glow green, while those on their head can glow red; this is due to two different kinds of luciferins and luciferases in their bodies. This is believed to be an adaptation to help confuse and frighten predators.
The term "Railroad Worm" is also sometimes applied to the Apple maggot.
The beetle family Phengodidae is known also as Glowworm Beetles, whose larvae are known as glowworms. The females and larvae have bioluminescent organs. They occur throughout the New World from extreme southern Canada to Chile. The family Rhagophthalmidae, an Old World group, used to be included in the Phengodidae. Larval and larviform female glowworms are predators, feeding on millipedes and other arthropods occurring in soil and litter. The winged males, which are often attracted to lights at night, are short-lived and probably do not feed. Females are much larger than the males and are completely larviform. Males may be luminescent, but females and larvae have a series of luminescent organs on trunk segments which emit yellow or green light.
More info: [link]
Thanks to Barry
for identifying it. Check out his gallery!
Featured by the lovely and talented Judy
in her "1287 and counting" journal: [link]