Underside of brown widow spider, showing hourglass marking. Also shows egg sac. Brown widow spiders occur in the southeastern, southern and southwestern United States, as well as worldwide in the tropical zone. The brown widow originally entered the U. Brown widow spiders are hard to identify due to the broad range of their coloration and their close resemblance to young black widow spiders. The easiest way to identify a brown widow is by the presence of their unique egg sacs that are woven with silk spikes on the surface. The color of the brown widow spider ranges from tan to gray and dark brown. There is an orange or yellow hourglass shape on the underside of the abdomen of the females. Males do not have this marking.
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