Argentine Ant

Argentine Ant

Native to Argentina and Brazil, the species was probably introduced at New Orleans via coffee ships before 1891. Now found in the southern states and in California, with isolated infestations in Illinois, Maryland, Missouri, Oregon and Washington.

  • Common Name: Argentine Ant
  • Scentific Name: Iridomyrmex humilis (Mayr)
  • Class/Order/Family: Insecta/Hymenoptera/Formicidea
  • Metamorphosis: Complete
  • Size


    Workers monomorphic, about 1/16" long; queens about 1/8-1/4" in length.

  • Color


    Body varies from light to dark brown.

  • Biology


    Colonies are located in moist situations near a food source. In autumn, outside colonies join together to form huge overwintering nests.

  • Habit


    Usually nest near a moisture source such as water pipes, sinks, potted plants. They prefer foods that are sweets such as sugars and syrup.

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