Field and laboratory studies were conducted on the nocturnal surface activities any feeding behavior of scorpions, using ultraviolet light. Two species, Vejovis confusus and V. mesaensis, showed a decrease in surface occurrence as the evening progressed, while Centruroides sculpturatus showed a random occupation throughout the night. Increased intensity of moonlight resulted in a significant decrease in surface occurrence in V. confuses and V. mesaensis; C. sculpturatus showed no significant response to increased illumination. Species differences in the amount of surface activity and feeding behavior were noted. Potential prey, food preferences, and mechanisms used in prey detection are also discussed.