Brown House Spiders

Brown House Spider Facts, Identification & Control

The brown house spider (Steatoda grossa) is also known as the false black widow or cupboard spider. They reside in numerous locations throughout the world. As with other related species, they may be found in dark, dank areas within human dwellings. They prefer basements, crawl spaces and garages. They may also be found outside, beneath rocks and piles of wood.

The false black widow, as the name indicates, may be confused with the black widow but the former lacks the characteristic hourglass marking on the underside of the abdomen as well as the potent venom. The venom of the brown house spider is not considered a significant medical concern.

Male brown house spiders reach up to 9 mm in size, while females may grow to exceed 10 mm. As is true of many spider species, males are more slender and females more corpulent. Brown house spiders are known to have long legs and can be many shades of brown or black. Some specimens are tinged red or purple and others exhibit sporadic white markings all over their bodies.

Brown house spider webs are woven with fine silk strands that are entangled irregularly and designed to trap prey. Although they most commonly prey on insects, brown house spiders sometimes consume other spiders, as well. Their webs also serve as mating and breeding grounds.