Related Clues:

• Firefly larva
• Firefly's young
• Night light?
• Mills Brothers classic
• Mills Brothers song subject
• Bioluminescent larva
• It's actually an insect
• Beetle
• Luminescent critter
• Kind of beetles that emit greenish light
• Glower in sack race
• Beetle which glows in the dark
• Luminous beetle
• Winged beetle - racing dinghy
• Beetle whose female bears luminescent green organs