Extension > Garden > Diagnose a problem > What insect is this? > Insects found indoors > Beetles, bugs, ants, and other insects without obvious wings - Under 1/4 inch long > Cornfield ant
Description: 1/10 inch long. (It is often challenging to recognize ants from a picture. Because different species may be treated differently, be sure an ant problem is correctly identified before attempting control).
Where/When: Occasionally found indoors during the summer, although it may be found indoors at other times of the year.
Significance: This is an outdoor species that occasionally enters homes. It doesn't nest indoors (it nests outdoors in the soil) and is just a nuisance.
More information on Cornfield ants