LYCOS RETRIEVER 
Spiders: Houses
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Many spiders may only live for about a year, but a number will live two years or more, overwintering in sheltered areas. The annual influx of 'outdoor' spiders into houses in the fall is due to this search for a warm place to spend the winter. It is common for female tarantulas to live up to twenty years.
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Brown Recluse Spider (Loxosceles reclusa): Brown recluse spiders belong to a group of spiders commonly known as violin spiders or fiddlebacks, because of a characteristic fiddle-shaped pattern on their head region. The brown recluse is golden brown with a dark brown or black "fiddle," which is often shiny. They range from 5-15 mm (1/4 to 3/4 inch) long. Brown recluse spiders are found primarily in the South and Midwest. They are rarely, if ever, found in Rhode Island. Brown recluse spiders live in basements and garages of houses, often hiding behind boards and boxes. Bites sometimes occur when the spiders hide in towels or clothing.
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These are large, dark, and somewhat hairy spiders that hunt by running down prey on the ground. They often wander into homes in the cool autumn. They have a superficial resemblance to the house spider (Fig. 14).
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Insects can get trapped in spider webs, providing nutrition to the spider; ... not all spiders build webs to catch prey, and some do not build webs at all. The word "cobweb" is usually used for a web inside a house, where dust has gathered on the sticky silk, forming long, hanging streamers.
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These spiders are both nomadic and common, so any control measure will be only a short term solution. If there is a population of these spiders in your area, then they are likely to re-enter houses after the effects of insecticides have worn off.
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