Very rare, Paruroctonus williamsi has only been collected once, in the Grapevine Hills, Big Bend National Park, Brewster County, Texas, and has not been found since.
Polis, G. A. 1990. The biology of scorpions. Stanford University Press, Stanford, CA.
Scorpions of the Chihuahuan Desert
Aaron Bodor, June 2006.
A.H. Harris, Last Update: 30 Jun 2006.