How to Identify and "Call" Lightning Bugs or Fireflies
Photinus sp. (Photo: James Jordan, Flicker Sharing).
An "Enlightening" Conversation
As summer rolls around, it's time again for the emergence of fireflies or lightning bugs. They are the bug all kids love to chase and catch. These benign insect ambassadors have been many children's introduction to the world of beetles and friendly insects. For today's post I want to introduce you to the three most common groups of fireflies in the Eastern US, and how you can use LED flash patterns to call the fireflies to you. It makes a great lesson plan for evening programs, or just something fun to do with the kids on a summer night.
Fireflies, or lightening bugs, are beetles in the order Coleoptera, and there are about 170 species in North America. Unlike their cousins, that have hard-bodied elytra (or wing coverings), their bodies and wings are relatively soft, with leathery wing coverings. Their bodies are usually about 2 cm long, and blackish, with reddish or yellow spots on their head covering (also called the pronotum). Around the world, there are over 2,000 species of fireflies, and most live in tropical, moist and damp areas, in part because of their soft bodies. Lightning bugs are called this because their abdomens glow or light up, using a chemical process called bioluminescence. We'll get more into this in a bit, but first, let's look at their life cycle.
In the Eastern US there are three common families of fireflies that we see, Photinus, Pyractomena, and Photuris. You can distinguish them apart by looking at their pronotum (big segment with dot behind their head) and their wings.