Even in places as well-studied as the national parks of North America, new species are still being discovered. With the help of ultra-violet light (which causes scorpions to glow bright-green, Matthew Graham (a fellow UNLV PhD candidate) found the specimen during a scorpion inventory of the Death Valley National Park in 2009.
Recently, Matthew Graham, Dr. Jef Jaeger and I have described the elusive new scorpion species, Wernerius inyoensis (named after the Inyo Mountains where it was found). We published our findings in the open access journal ZooKeys. [PDF]
Webber MM, Graham MR, Jaeger JR (2012) Wernerius inyoensis, an elusive new scorpion from the Inyo Mountains of California (Scorpiones, Vaejovidae). ZooKeys 177: 1-13. doi:10.3897/zookeys.177.2562