SAN ANTONIO Humans arent the only life form looking for cooler places during the summer. Scorpions sightings are increasing around San Antonio as we head into the hottest months when scorpions are most active. Texas has 18 species of scorpions with the most common species in the Central and South Texas area being the striped bark scorpion, according to AgriLife Extension Service entomologist Wizzie Brown. The scorpion is yellowish-tan with two dark stripes that run along the back and can grow up to 2 inches long, said Brown. The severity of the sting is dependent upon the individual scorpion and the persons reaction to the venom, Brown said.