The female Black Widow spider has a rounded black body (½ inch) with a red hourglass on the underside of the abdomen. The hourglass can vary from bright to faint red, and the two triangles of the hourglass may not touch. The male Black Widow is smaller, and has shiny black abdomen like the female but lacks the hourglass. Both sexes may have yellow and red marks on their backs in immature stages.

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A Guide to Western Black Widow

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