This photo doesn't do justice to this impressive little insect. It was taken with a flash in almost full darkness. In the dark, the back end of it glowed like a bright green LED. Now, if only I could find a swarm of them that were prepared to put on a show for a long exposure :)
Lampyridae is a family of insects in the beetle order Coleoptera. They are winged beetles, and commonly called fireflies or lightning bugs for their conspicuous crepuscular use of bioluminescence to attract mates or prey. Fireflies are capable of producing a "cold light", containing no ultraviolet or infrared rays. This chemically-produced light, emitted from the lower abdomen, may be yellow, green, or pale red in color, and has a wavelength from 510 to 670 nanometers.
http://en.wikipedia.org/wiki/Lampyridae
Firefly
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