General Information

Odorous House Ant Information Sheet

Odorous House Ant (Tapinoma sessile) Description of Workers: Small workers, around 1/16-inch to 1/8-inch (2-3 mm); dark brown to black. Bitter odor when crushed – said to smell like rotten coconuts.

Most common structure-invading ant in Washington and Oregon. They nest in a wide variety of places outdoors and inside. These ants are known for constructing shallow nests in soil underneath objects, such as stones, patio blocks and debris outdoors in the warmer regions of the US. Inside, they prefer areas with moisture such as around hot water pipes, heaters and most wall voids of any structure. Odorous house ants have multiple queens in each colony and the colony can number as many as 600,000 ants...

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