red imported fire ant

…member of the genus, the red imported fire ant (Solenopsis invicta), was accidentally introduced into the southern United States from South America. The red or yellowish ants are 1–5 mm (0.04–0.2 inch) in length and can inflict a severe sting. The sting is rated 1.2 on the Schmidt sting pain…

…States is plagued by the red imported fire ant (Solenopsis invicta), an aggressive swarming and biting species native to South America. The species may have arrived in the United States in shipments of soil and other landscaping materials.