On Bug Guide: https://bugguide.net/node/view/1753484
On a creosote bush
Scorpions with two metasomae (tails) are extremely rare, with one estimate I saw as one in every 5,000 specimens. This specimen is approximately 3cm long head to stinger and is being maintained in captivity to study its behavior.
I found this using a black light flashlight with BJ Stacey (@finatic) at the Carrie Nation Trailhead parking lot at Madera Canyon, Arizona.
Read a detailed account of this specimen's discovery and observation updates at the journal post linked below:
http://www.inaturalist.org/journal/jaykeller/7020-rare-arizona-bark-scorpion-with-two-metasomas-tails-and-stingers