Black Widow Spiders
Description, habits, and life cycle.
Brown Widow Spiders
Offers identification tips and photographs for the poisonous Brown Widow, whose hourglass marking is orange to yellow orange in color.
Wikipedia: Widow Spider
Article about widow spiders, members of the spider genus Latrodectus that includes approximately 31 recognized venomous species, with the black widow spider being the best known member of the group.