Introduced from South America starting in 1997 to control the invasive South American fire ant Solenopsis invicta. It doesn't seem to have a significant impact, though.
released along with P. curvatus (Porter et.al., Florida Entomologist 84(4), Dec 2001)
Henne, Donald C. et al. 2007. Status of the Fire Ant Decapitating Fly Pseudacteon tricuspis (Diptera: Phoridae) in Louisiana. The Florida Entomologist 90(3):565-569.