Black or reddish-black, sometimes winged ants up to 1/2-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, which have thick waists, these pests have narrow, constricted waists.
Remove nearby logs, stumps, and woodpiles. Seal openings in the foundation, windows, and other access areas into the home. Inspect the home for any rotting wood and replace it.