Spiders in the Midwest

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Hi everyone! I'm wondering, are there any type of deadly spiders in Illinois? I have a friend who says there are Black Widow Spiders in Illinois, but I'm not sure. Does anyone know what, if any, deadly or poisonous spiders can be found in Illinois? If so, what areas? I can't seem to find any good websites about the spider population of this state and I am just curious. ~LRB