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Allegheny Mound Ant Facts & Information

Protect your home or business from Allegheny mound ants by learning techniques for identification and control.

Allegheny mound ant illustration
Formica exsectoides
3.2 to 6.3 mm
Reddish head & thorax
Brown or black abdomen & legs
May bite if disturbed


How do I get rid of Allegheny mound ants?

What Orkin Does

If Allegheny mound ants are nesting on a property, it is usually best to call a pest control professional. There are several methods they can use to control Allegheny mound ants.

Orkin Pros are trained to help manage Allegheny Ants and similar pests. Since every building or home is different, your Orkin Pro will design a unique ant treatment program for your situation.

Keeping ants out of homes and buildings is an ongoing process, not a one-time treatment. Orkin’s exclusive A.I.M. solution is a continuing cycle of three critical steps — Assess, Implement and Monitor. Orkin can provide the right solution to keep ants in their place...out of your home, or business.

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Frequently Asked Questions

Behavior, Diet & Habits

Understanding Allegheny Mound Ants


  • Color: Allegheny mound ants have a reddish head and thorax. The abdomen and legs are dark brown to black.

  • Size: The workers vary in size from 3.2 to 6.3 mm.

They do not sting, but they can bite if the mound is disturbed.


The workers make galleries and tunnels in the ground. The tunnels extend as deep as almost 1 m (~3 ft) into the soil. As they dig, the workers pile the excavated soil up to make the mound. The mounds can reach records of about 5 m (~16ft) in diameter, especially with older nests found in fields and wooded areas. The mounds that these ants build are frequently mistaken for fire ant mounds.

Allegheny mound ants nest in fields, pastures and wooded areas. They also live in playgrounds and residential lawns in rural and suburban areas. They do not usually enter homes, but workers often forage on patios and decks.


Allegheny mound ants eat insects and honeydew, a sweet substance produced by sap-feeding insects like aphids or scales. The workers protect aphids and other insects that produce honeydew. The ant workers sometimes damage trees and shrubs by chewing openings in the bark and spraying formic acid. This is done to kill trees that are shading the nests. If these ants are disturbed, they give off a distinct formic acid odor.


Queens produce eggs that become workers and reproductives. To establish a new colony, a mated queen and a contingent of workers leave the colony to select a new nesting site.

More Information

The Allegheny mound ant is a type of mound-building ant in the United States. These ants are found along the Atlantic coast from Nova Scotia to Georgia. They are most common in the Midwest and Northeast.

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