What is the biggest insect?

What bioluminescent insect was this? And no, LSD is not an answer.

• What strange insect did I set that lit up bright orange and flew around the Ecuadorian cloud forest? Back in the summer of 2005 I was in the cloud forests of Ecuador, about 50-80 miles north of Quito. One night I saw the strangest bioluminescent insect fly through the forest. It lit up bright orange, almost like it was on fire. Periodically it would land and the light would go out. Then as it flew again, it lit up. It may have had two parts of its body lit up (spots perhaps), but I couldn't tell for sure. I tried to get close enough to see what it was but couldn't. It appeared to be an insect of some sort, at least 3" long, but I could be wrong. Its flight pattern suggested it was fairly large (bigger than a bumblebee). It was NOT a firefly. It was MUCH brighter than a firefly (at least, the types you see in the southeastern U.S.). And it flew a lot faster as well. Plus the color was orange and not green. I saw it fly around for at least 5 minutes so I am quite sure of what I saw. What the hell could this have been? I emailed a tropical entomologist shortly after I saw it, and even he had no idea. No, I wasn't on drugs...

• Answer:

  Dunno, but when I was in Guyana there were several species of bioluminescent insects, but the locals all just called them "candle flies" pretty much. There were greenish ones that went on and off like fireflies, and one larger, longer one that was was dark brown with a light-up orange abdomen which I found on the dining table one evening. It was dying, but pulsed in my hand for a good ten minutes or so, looking rather like a lit cigarette.