Black or reddish black, winged or wingless ants up to ½ inch long are seen around the home. Piles of sawdust may be found in the basement or attic, under porches, or near supporting girders or joists. Slitlike holes are often present in woodwork. On warm spring days, swarms of winged ants may cluster around windows. Unlike termites, these pests have constricted waists.
(Camponotus species)
  Many closely related species of these wood-damaging ants are found throughout the United States. Carpenter ants bore into moist, decaying wood, forming extensive galleries in which they make nests. They do not eat their sawdustlike wood borings, but feed on other insects, plant sap, pollen, and seeds. When ant colonies grow too large, part of the colony will migrate, often invading nearby homes through windows and other similar entry points. They will either colonize undisturbed hollow spaces such as walls or bore into structural timbers, ceilings, and floor areas. They require damp and rotted wood. In addition to weakening wood, carpenter ants may infest pantries, and inflict painful bites.
Dust baseboards, windowsills, door frames, and other places where ants crawl with an ORTHO Ant-Stop Ant Killer Dust. Dust into nests if possible. Remove nearby logs, stumps, and wood piles. Seal openings in the foundation, windows, and other access areas into the home. Spray along the foundation and around the outside of door and window frames and sills with ORTHO Ant-Stop Ant Killer Dust.