http://cisr.ucr.edu/identifying_brown_widow_spiders.html this UC Riverside website Identifying brown widow spiders CISR.UCR http://cisr.ucr.edu/identifying_brown_widow_spiders.html CISR.UCR Rick Vetter’s web page CISR.UCR http://cisr.ucr.edu/identifying_brown_widow_spiders.html fabulous resource for identifying brown widow spiders http://cisr.ucr.edu/identifying_brown_widow_spiders.html UC Riverside