Paruroctonus silvestrii, commonly known as the Arizona bark scorpion, is a species of venomous scorpion found in the southwestern United States and northern Mexico. It is a small to medium-sized scorpion, measuring around 2.5 to 3 inches in length. It is known for its pale yellow to tan coloration and distinctive slender pincers. The Arizona bark scorpion is highly venomous and its sting can cause severe pain and discomfort, although it is rarely fatal to humans.