Jan 27, 2025 · Female brown widow spiders are relatively small at about 13 millimeters. The males are about half the size of the females. The brown widow spider belongs to the Latrodectus genus of spiders,...

This is the easiest way to tell a brown widow from a black widow. The egg sac of the brown widow is round and yellow with many little silk spikes sticking out from its surface, looking like a big pollen grain or one of those harbor mines from World War II.

Latrodectus geometricus, commonly known as the brown widow, [2] [3] brown button spider, grey widow, brown black widow, [3] house button spider or geometric button spider, is one of the widow spiders in the genus Latrodectus.

Female brown widow spider, Latrodectus geometricus Koch (nearly black coloration). Photograph by Donald W. Hall , Department of Entomology and Nematology, University of Florida. Identification : Dark specimens resemble black widows.

Oct 31, 2023 · Size: Female brown widow spiders are around 0.5 in long (1.2 cm) and males are one-third of them. The usual leg span of female spiders is 1.5-2.0 in (3.81-5.08 cm). Color: Just like their name, these spiders are mostly brown or tan. Some spiders can be pale while others can be extremely dark, like black.

Jan 13, 2020 · When female brown widow spiders bite, they typically inject less venom than a black widow spider, and the bites usually don’t cause any symptoms beyond the discomfort of the wound.

Apr 6, 2003 · The mature female of the brown widow spider is from 1 inch to 1 ½ inches long (with legs extended) and can live 1 to 2 years. In her lifetime, she can lay 10 to 20 eggs sacs with each sac containing approximately 250 eggs.

A mature brown widow female looks very similar to an immature western black widow, thus some skill is needed to identify the two accurately. However, the brown widow egg sac, as described in the next paragraph, is distinctive and a much surer way to confirm the species.

Males do not bite, however, the female brown widow is a venomous spider that injects a neurotoxic venom when it bites its prey. The brown widow builds its web in secluded, protected sites around homes and in woody vegetation with branches.

Oct 24, 2022 · Brown Widow Spider Facts. The brown widow spider became established in Southern California in 2000 and appears to be displacing the black widow in some of its habitats, especially in urban areas. They build their webs in secluded areas around homes and in vegetation. Mature female brown widows are smaller than mature female western black widows.