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| | MSN Encarta - Black Widow Spider |
 | | Black Widow Spider, common name for any of several related long-legged, smooth-bodied spiders, chiefly inhabiting the Tropics, but also common in the southern United States and found as far north as Canada. |
 | | At least three other species found in the United States are also poisonous to humans: the brown, or gray, widow spider; the red widow spider, with irregular red and yellow markings; and the northern widow spider, with a row of red spots above and two red bars on the underside of the abdomen. |
 | | The brown, or gray, widow spider is classified as Latrodectus geometricus, the red widow spider as Latrodectus bishopi, and the northern widow spider as Latrodectus variolus. |
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