Smeringurus mesaensis is a scorpion in the family Vaejovidae, formerly placed in Paruroctonus. It is native to the arid regions of the southwestern United States (notably California and Arizona) and into northern Mexico. This species is sandy-colored, relatively moderate in size, fossorial, with venom that is not considered dangerous to humans. Hobbyists note that it is fast and somewhat defensive, but manageable in terrariums; many regard it as suitable for intermediate keepers due to its speed and moderate temperament.