Female redback spiders are black (occasionally brownish) with an obvious orange to red longitudinal stripe on the upper abdomen, with the red stripe sometimes being broken, and an hourglass-shaped red/orange spot on the underside of the abdomen. Females are about a centimeter long, but males are just a few mm. The males' red markings are often less distinct. The male's body is light brown with white markings on the upper side of the abdomen and a pale hourglass marking on the underside. Juveniles have additional white markings on the abdomen (http://australianmuseum.net.au/Redback-Spider, accessed 24 December 2009)
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