Less Common Household Ants Field Ants, Formica spp. Field ants can easily be confused with carpenter ants but they are not as likely to forage indoors. They are black, brown, red, or combinations of these colors.
Colonies consist of major and minor workers.
Household sweets and honeydew. They also eat live and dead insects. Some may nest under concrete slabs and enter buildings through cracks. They do not nest inside buildings. Look for and treat outdoor nests.