Field ants can be all black in color or reddish brown and black. They have one node (bump between middle and rear body sections). Field ants are often mistaken for carpenter ants, but are not as likely to forage indoors. They also have a depression in the their thorax which differentiates them from the carpenter ant. Field ants vary in size and are most commonly found in yards and gardens.
Field ants nest outdoors in loose soil. They may produce mounds (sometimes incorporating twigs, dried leaves and other plant materials) in exposed areas or nest under rocks, logs, etc. They do not frequently come indoors.