Red Imported Fire Ant

Solenopsis invicta

Hymenoptera: Formicidae

Peralta Park, Anaheim Hills, Orange County, CA. 9/6/07.

Description and warning from Orange County Vector Control

Listed in "100 of the worst" in the Global Invasive Species Database © Peter J. Bryant

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Two nodes between the thorax and abdomen

Toothed mandibles

Flat-topped nest with multiple entrances

Underground galleries

Two workers; one moving a pupa

Head and thorax red; abdomen brown

Large size variation

Large size variation


Moving a larva




Wing of male

Pustule 24h after sting. Diameter 4mm.

Pustules 24h after sting. Diameter 3 and 4mm.