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).

So the Brown Widow has great potential to harm, and should be handled very carefully if encountered. How to identify (and misidentify) Brown Widow The brown widow spider, Latrodectus geometricus, is not native to the United States. Conlan said until more are found in rural areas outside of those urban settings, it will be difficult to tell if the invasive brown widow is out-competing … The population of this kind of spider continuously expands within Southern California and also northward towards Central California. The Brown Widow Spider is a great tropical spider to be kept in captivity. It is a venomous creature, and must be handled with respect. Physical Description and Identification Adults. The top of the abdomen usually has rows of red or orange spots outlined in white or yellow. There is a geometric pattern on the upper side of the abdomen. Why is that? Theridiids are known as comb-footed spiders because of the comb-like rows of stout, curved bristles on the tarsi (feet) of the hind pair of legs ( Figure 1 ). Red widow (Latrodectus bishop) Adult female red widow spiders are reddish-orange, with reddish colored legs and a black or dark colored abdomen. Female: about 12-16 mm (> 0.5 inch) long (body length only, not including legs) Male: much smaller, 6-8 mm (about half the body length of a female) but with longer legs.

It's not as dangerous as some other widow spiders because the Brown Widow Spider is less likely to bite someone, and has less toxic venom. Even though brown widow populations have jumped, he said, they’re still being found mainly in urbanized areas.

Brown widow spider is part of the local spider fauna in the California area of the USA most particularly in urban Los Angeles and San Diego area. The brown widow spider (Latrodectus geometricus Koch) belongs to the family Theridiidae (Foelix 2011, Howell and Jenkins 2004). Figure from Ibister & Fan, 2011. Actual Size: 3-7mm. How to identify (and misidentify) Brown Widow The brown widow spider, Latrodectus geometricus, is not native to the United States. Brown widow: Shy biters ... brown widows are also shy critters, and their bites are thought to be less capable of significant venom transfer, compared with their black cousins. Like black widow spiders, brown widows have an hourglass marking on the underside of the abdomen, but their hourglass is typically orange or yellow. Despite having somewhat potent venom, we still think they’re harmless. There is a general striped pattern on the legs and dorsal (top) side, and brown mottling on the ventral (bottom) side. The brown widow spider (Latrodectus geometricus Koch) belongs to the family Theridiidae (Foelix 2011, Howell and Jenkins 2004). Its coloration ranges, but it is usually either dark grey, brown, or black. Measuring Spider Bite Severity . Characteristics: Black or dark brown. Also, brown widow bites are less painful than the bite of the western black widow. 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. Brown Widow Spiders usually curl up into a ball, and drop to the ground as a primary defense. Theridiids are known as comb-footed spiders because of the comb-like rows of stout, curved bristles on the tarsi (feet) of the hind pair of legs ( Figure 1 ).

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