Several species occur in the United States, but the western widow, Latrodectus hesperus, is the overwhelmingly dominant species throughout Colorado. These species do not all behave alike. They considered as most venomous spider in the world – Read about Black Widow Spider Poison. Females are solid shiny black with globose abdomens and a ventral red marking that can vary from a perfect hourglass with triangles touching at the tips to separated red triangles to faint red markings. Latrodectus hesperus. Indoors, widows similarly occur in dark, undisturbed sites such as behind furniture or under desks. The web A sense of burning in the soles of the feet is often noted.Often there is a general sense of discomfort shortly after the bite, and acute symptoms increase in severity during the first day. Symptoms usually decline after 2 to 3 days but some may continue for several weeks up to a month after the bite.Other mammals vary in their reaction to widow toxin. These males may live longer than those not associated with a female’s web. This should be done before cold weather forces spiders (and many insects) into homes to seek shelter. Toxicon, 2(2), 93–102Monte AA, Bucher-Bartelson B, Heard KJ (2011) A US perspective of symptomatic The spider species Latrodectus hesperus, commonly known as Western Black Widow, belongs to the genus Latrodectus, in the family Theridiidae. grape size comparison with adult spiders; male (left), female (right)diagnostic feature; ventral hourglass marking on female abdomendiagnostic feature; ventral hourglass marking on juvenile abdomenImmature black widows are sometimes confused for the Australian red back, Body lengths when mature: male: 3 - 6.5 mm, female: 8 - 15.5 mmImmatures are striped and much lighter in color, males retain immature coloration, females are solid shiny black with a Description: free-hanging, tear-drop or spherical in shape, light yellow to tan in color, margins distinct, very tough papery silk coveringTime of year eggs are likely to be laid: throughout year if it is warm enoughElsewhere: western United States from British Columbia to Mexico, east to central U.S. statesThis species has been transported and become established outside of its range.Nocturnal. Male widows, are less likely to be encountered than females. CSU Extension - A division of the Office of Engagement. Rare in grape bunches. Both the males and females have the same color, with the topside being gray or olive, striped in yellow or white. Therefore, widow spiders are most often found in abandoned rodent burrows, loose stone or wood piles, or the corners of rooms, garages, and outbuildings. It is also a good idea to wear gloves and a long-sleeved shirt when working in spider infested areas.Insecticides can be useful for adult spider control but are not particularly effective against the eggsacs. The population was previously described as a subspecies of Latrodectu… This "hourglass" mark can be yellow, and on rare occasions, white. Under favorable conditions, females may produce several egg sacs in their lifetime.Eggs hatch in the egg sac about 2 weeks after they are laid. Developmental rates are greatly influenced by temperature and the availability of food. At that time, they disperse and leave the egg sac, often by a process called “ballooning.” Ballooning spiderlings release small silk strands that allow them to catch wind currents and be carried in the air.If young spiders find a suitable spot they begin to produce a web; however, the majority die before successfully producing a web. However, aggressive females, those that are particularly hungry, may charge the approaching male and cause him to delay or abandon his attempt.Once touching the female, courtship begins as a tapping of the legs. Latrodectus a broadly distributed genus and contain 31 recognized species.

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