Pyropyga sp. Rock Creek Park, Washington, DC, USA.
I found this glow worm in my yard this morning. His end glows like a firefly.
The lampyrids in Washington don't produce bioluminescence. This one dropped off the plant it was on before I could get a photo that was in focus.
Lots of fireflies noted along river loop during moonlight paddle. South side of island.
Santa Cruz County, Arizona, US
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 produce a "cold light", with no infrared or ultraviolet frequencies. This chemically produced light from the lower abdomen may be yellow, green, or pale red, with wavelengths from 510 to 670 nanometers.