I built this Mosquito Gun to catch Mosquitoes, and it works. It may also work on Lightning Bugs. I used an orange juice bottle, a dollar store fan, some cheesecloth, a knife and some tape. I demonstrated the suction it produces with some dry ice, but that's not something you'll need to use. Have fun and turn the tables on those suckers!
Followup Video: It works on Lightning Bugs. But there's a glitch.