Depending on the species, the size of the workers ranges from 4 to 8 mm. Coloration includes yellow, red, black or a combination of red and black.
Field ants usually nest near trees, rocks, sidewalks, fences or foundations of buildings. Many species of field ants make a mound with the soil that they excavate under the ground. Sometimes people mistake these mounds for fire ant activity. Field ants do not sting, but they will bite when they are disturbed. Some field ants can spray formic acid while they bite, so their bites can be painful.