Pseudouroctonus williamsi Sissom & Francke, 1981
2 Mission Gorge, 1 mile W Padre Dam, 100 feet, 7 July 1969 (S.C. Williams, V.F. Lee)
2 Mission Gorge, March 31, 1940 (Earl Brown)
2 Wild Cat Canyon, August 9, 1962 (S. C. Williams) from pit fall trap in burned area.
* Mission Gorge, Summer 2001, under large flat rock along main trail (Matthew R. Graham)
References:
* Collected and identified by a credible source but not published
2) Gertsch, W. J. & M. E. Soleglad. 1972. Studies of North American scorpions of the genera Uroctonus and Vejovis. Bulletin of the American Museum of Natural History, 148(4): 549-608