Order: Hymenoptera
Family: Formicidae
Genus: Solenopsis
Solenopsis invicta was introduced from South America into Alabama in 1918, and has been gradually spreading throughout the Southeast ever since. The species is highly aggressive when a nest is disturbed, pouring out of every orifice of the colony. They inflict a painful sting, which induces welts on the skin. Further South, the colonies can be enormous and this species has become a major pest. In the Duke University area, their nests look like broad mounds of loose soil raised a few inches aboveground. Numerous colonies can be seen along the sidewalks of Circuit Drive and Science Drive on the Duke Campus.
![Solenopsis invicta - full dorsal view](http://sites.duke.edu/dukeinsects/files/2015/09/Solenopsis_invicta1.jpg)
![Solenopsis invicta - close up of nest activity](http://sites.duke.edu/dukeinsects/files/2015/09/Solenopsis_invicta2.jpg)
Solenopsis invicta on Bugguide.net
Solenopsis invicta on Wikipedia
Sources
(2) Triplehorn, C.A. and N.F. Johnson, Borror and Delong’s Introduction to the Study of Insects, 7th ed., (2005), Thomson Brooks/Cole.