Normally the black widow and the brown recluse commonly bite people.
The black widow occurs in southern Canada and every state of the continental United States except Alaska.
The brown recluse occurs in the central region of the United States from Indiana, Illinois, and Iowa south to the Gulf states, and also in Arizona and California.
The female black widow, the dangerous sex, is shiny black with red markings, usually in the shape of an hour glass on the underside of her abdomen.
She is about one-half inch long.
The brown recluse female is as much as one-half inch long, has very long legs, and is brown in color with a dark violin-shaped marking on the cephalothorax.
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