Black Widow Spiders can be found in Ontario. The house and black widow spider belong to the same family. The house spider is more commonly found within the house whereas the black widow spider is more likely to be found in dark crawl spaces or garages. The black widow spider is shiny black with a distinctive red hourglass shaped mark on the underside of the abdomen. It spins a small, silk web close to the ground. Its name is derived from the female's tendency to consume the male after mating.

The female is usually black with a red spot or hourglass shaped mark on its round abdomen. The male usually has light streaks on its abdomen. The black widow spider is about 38 mm in diameter, including legs. In infested areas, black widow spiders are common around wood piles, and are frequently encountered when homeowners carry firewood into the house. They are found under eaves, in boxes, meter boxes and other undisturbed places. She hangs belly upward and rarely leaves the web. The black widow is not aggressive, but it will bite instinctively when touched or pressed. Be very careful when working around areas where black widow spiders may be established. Wear gloves and pay attention to where you are working. Black widow bites are sharp and painful, and the victim should seek medical attention immediately.

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