Black widows are found in temperate regions throughout the world, including the United States, southern Europe and Asia, Australia, Africa, and much of South America. Brandon Runyon, Swat Pest entomologist, says, “What’s fun is when we do get these calls we actually bring a lot of stuff back here. Each sac can contain 200 or more cream-coloured eggs. Learn to identify a black widow spider web and you’ll always know what type of spider you’re dealing with, and when it’s time to contact a pest management professional. Where Do Black Widows Live? The spiders' venomous bites can kill a mosquito, fly, caterpillar or even a grasshopper. And yet, black widows do sometimes end up in people's kitchens. What It Feels Like to Be Bitten By a Black Widow Spider By Will Smith on May 24, 2012 at 5:55 p.m.. Like black widows, both red and brown widows are venomous. Black widows are fairly reclusive spiders, and are nearly always found in places where they won't run into people. Spiders That Look Like Black Widows but Aren't Brown widow spiders (Latrodectus geometricus) Immature brown widows and western black widows look very much alike when they are young. Seek medical attention immediately if symptoms persist or worsen. Black Widow Spiders Facts, Identification & Control Latin Name. A black widow spider bite causes immediate and intense pain. Where do black widows live? Unlike black widow spiders, false black widow spiderlings are dark like their mothers when they emerge. False Black Widow Spider Reproduction False Black Widow Spiders mate in the spring and the females can produce three or more egg sacs or cocoons from May through to July. Hourglass marking: Black widows are identified by red hourglass marking on the underside of their abdomens.This marking is bright red and signals danger to predators and attackers. SAC SPIDERS (Miturgidae and Clubionidae) Most common in northern states such as Illinois is the northern black widow (L. variolus) which is replaced in the Southwest by the western black widow (L. hesperus). They can sometimes have red, yellow or white markings on the abdomen as well. The black widow (Latrodectus mactans) inhabits the southern half of the country. Immediately wash the bite area with soap and water. Once they reach adulthood, black widow spiders can range from 1/8 of an inch to 1 1/2 inches in length. Breeding. Northern Black Widow Spider (Latrodectus variolus) The Northern Black Widow Spider is found throughout the eastern US, from southern Canada south to Florida, and west to eastern Texas, Oklahoma and Kansas. Appearance What do they look like? Spiders found in Illinois include 33 unique species from confirmed sightings by contributing members of Spider ID. Brown widows typically live along the coast of Daytona Beach. The black widow is preyed upon by mud-dauber wasps. Not all widow spiders are black. Spiders are generally more afraid of you than you are of them. Webs and Feeding These spiders spin large webs in which females suspend a cocoon with hundreds of eggs. But in the United States, adult females of the three most common widows are almost always a shiny black. False black widows make an egg sac that looks like a cotton ball with indistinct margins. They occur throughout all four deserts of the American Southwest. Black widows are solitary year-round except during this violent mating ritual. Black Widow Web Identification Checklist. But while the cobweb spiders typically found in homes may resemble widow spiders, their bites are not dangerous.