The American Arachnological Society Committee on Common Names of Arachnids. The Black Widow and Five Other Venomous Spiders in the United States. These spiders are not known to bite people and are not a medically important species. The sac is held by the female in her chelicerae as she hangs inverted in her web.Īn unusual behavior is that the spiders will rapidly vibrate in a circular fashion in the web if threatened, making it difficult to see them. The eggs, which are about 1 millimeter in diameter, are deposited in clusters of twenty-five to sixty and wrapped in a thin layer of silk. It takes approximately one year for the spiders to mature and they can live for two or more years as adults. Life History/Behaviorīoth male and female spiders can be found in heated structures throughout the year. The webs are an irregular mesh of threads. The forelegs of the adult female are about 50 millimeters in length. The color of the carapace and abdomen is a pale tan or yellow with a gray mark in the center of the carapace. The eyes are arranged in two triads of larger, light-colored eyes on the top of the cephalothorax and a pair of dark, small eyes on the front. The abdomen is about three times as long as it is wide and cylindrical in shape. The females are from 7 to 8 millimeters and the males 6 millimeters in length. This spider is commonly found in cellars, warehouses, garages, caves, and other dark, quiet, protected spots. Although these spiders can develop large populations in protected locations, they are not known to be in any way harmful. It has extremely long legs and is found in many types of buildings throughout the year. The longbodied cellar spider is the most common of the Pholcidae in the United States. Pholcidae-Cellar or Daddylong-legs Spiders
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