House centipedes (Scutigera) are common arthropods with long, flattened, segmented bodies with one pair of legs per segment. The house centipede is up to 1 1/2 inches long and has 15 pairs of very long, almost thread-like, slender legs. Each leg is encircled by dark and white bands. The body is brown to grayish-yellow and has three dark stripes on top.
Centipedes prefer to live in damp portions of basements, closets, bathrooms, unexcavated areas under the house and beneath the bark of firewood stored indoors. They do not come up through the drain pipes.
House centipedes feed on small insects, insect larvae, and on spiders. Thus they are beneficial, though most homeowners take a different point-of-view and consider them a nuisance. Technically, the house centipede could bite, but it is considered harmless to people.
Information provided courtesy of Ohio State University Extension