Our insect of the week is Phengodes fusciceps. This beetle species is classified in the family Phengodidae (also known as glowworm beetles). Both females and larvae have bio-luminescent organs. Larvae and females are predators and typically feed on millipedes. Winged males are often attracted to lights and are thought not to feed. This species was described by John LeConte in 1861. The name “fusciceps” means “dark headed.” It is found in mid-western US states (I have collected it in Illinois and Kansas). Males are encountered much more frequently than larvae and females (which do not fly). They are easily identified by their prominent antennae. This is yet another example of insects we find in central Illinois. Not much is known about their general biology (other than anecdotes concerning feeding behavior).