Pyramid Ants

Dorymyrmex spp.

pyramid ant

Pyramid ant (Gary Alpert, Harvard University,

pyramid ant

Pyramid ants (Jerry A. Payne, USDA Agricultural Research Service,

pyramid ant

Pyramid ant mound (John Pearson,


  • small; 1/8 inch long
  • workers of one size
  • single node (bump between middle and rear body sections)
  • color ranging from yellow, brown, to black
  • have a pyramid-shaped projection on top of the thorax

Nesting Habits

  • prefer open, sunny areas; soil nesting
  • distinctive nest entrance consists of a hole surrounded by a mound of excavated soil
  • nests not located indoors
  • nests are typically small and shallow


  • live and dead insects
  • honeydew produced by aphids and other insects
  • feed on a variety of foods, but prefer sweets


  • occasionally invade buildings in search of food or moisture
  • can bite
  • can have unsightly mounds

IPM Recommendations

  • If ants are found indoors, follow them back to the outside foundation wall to determine the entry point.
  • Seal cracks and crevices to exclude foraging worker ants.
  • Use sweet ant baits.
  • If the nest can be located, directly drench with an appropriately labeled insecticide.

Additional Resources

IPM for Ants: Integrated Pest Management in Sensitive Environments (University of Nebraska-Lincoln Extension)