41. Learn About Spiders: Black Widow Spiders And Brown Recluse Spiders From NPMA Want to learn more about the spiders that could invade your home? Through PestWorld.org, the National Pest Management Association teaches you about spiders, http://www.pestworld.org/Database/FactSheet.asp?ID=127

42. 'Black Widow Spider' Description Black Widow Spider. (from the Bug Books series, Set 5 of 5). What do black widow spiders eat? Where do black widow spiders live? Is a black widow s venom http://www.heinemannlibrary.com/products/title.asp?id=1403407622

43. Black Widow (Latrodectus Variolus) black widow spiders are black, shiny and have a very round abdomen. black widow spiders are common around woodpiles and are frequently encountered when http://www.michigan.gov/dnr/0,1607,7-153-10370_12145_12204-36489--,00.html

Skip Navigation Michigan.gov Home DNR Home Links ... Ask DNR document.form2.SearchCriteria.size=10; Wildlife Conservation Strategy Landowner Incentive Program Michigan Breeding Bird Atlas Michigan Bird Conservation Initiative ... [Text Version] Black Widow ( Latrodectus variolus The version found in Michigan is called the northern black widow spider. These spiders are not nearly as large as many people think. The body of the female spider is about ½-inch long (1½-inch long including the legs). Males are smaller. Black widow spiders are black, shiny and have a very round abdomen. Females have a red spot (often shaped like an hourglass) on the underside of its abdomen. The male lacks the red hourglass marking but may have yellow and red bands and spots over the back. Black widow spiders are common around woodpiles and are frequently encountered when homeowners carry firewood into the house. They may also be found under eaves, in boxes, outdoor toilets, meter boxes and other undisturbed places. While they may bite when touched or harmed, they are not aggressive. Be very careful when working around areas where black widow spiders may live. Wear gloves and pay attention to where you are working. Black widow bites are sharp and painful, and the victim should go to the doctor immediately for treatment. To control the black widow, carefully remove all materials where they might hide. They can be cleaned out of an area simply by knocking down the webs, spiders, and round tan egg sacs with a stick and crushing them underfoot.

44. Widow Spiders The black widow spiders are less common and are generally associated with arid areas (western black widow) and higher elevations (southern black widow). http://www.extento.hawaii.edu/kbase/urban/Site/brwidow.htm

Urban Knowledge Master Widow Spiders Lactrodectus geometricus (Fabricius), Brown widow spider Lactrodectus mactans (Fabricius), Southern black widow Lactrodectus hesperus (Chamberlin and Ivie), Western black widow Author Hosts Distribution Damage ... References Author Julian R. Yates III Extension Urban Entomologist College of Tropical Agriculture and Human Resources University of Hawaii at Manoa HOSTS Insects, smaller spiders, sow bugs, centipedes, etc. DISTRIBUTION L. mactans: Eastern North America, eastern Mexico, and the West Indies; L. Hesperus: Oklahoma, Kansas, and middle Texas throughout the southwestern states; L. geometricus: world wide in the tropical zone. DAMAGE BIOLOGY EGGS The eggs sacs can be constructed by the females in one to three hours and are approximately 1 cm in diameter. Each female can produce 10 to 20 of these sacs during a lifetime, and each sac may contain 200 to 250 eggs. The eggs hatch within the sac in about two weeks. ADULTS The spiderlings undergo their first molt three to four days thence. In approximately 10 days they emerge from the sac through one to three holes that are about 1 mm in diameter. The spiderlings remain in the nest area for several weeks (135-240 days) where they undergo six to nine molts before reaching maturity. Female black widows can live 850 to 950 days when food is readily available. BEHAVIOR The brown widow spider is the most abundant and is commonly found in urban areas. It may be found indoors; however, favorite outdoor hiding places include the crawl space beneath homes and amongst piles of stored lumber, hollow tile blocks, abandoned vehicles, storage sheds, and stored items on shelves. Within the home, the brown widow may be found beneath tables and desks, behind shutters, in the angles of doors and windows, in the folds of clothing, in shoes, and under objects in dark, little-disturbed areas. The black widow spiders are less common and are generally associated with arid areas (western black widow) and higher elevations (southern black widow). Both can be found in crawl spaces, under rocks, in tiny voids, and in utility ducts.

45. Black Widow Spider - Wikipedia, The Free Encyclopedia Adult female black widow spiders are shiny black with an hourglass shape marking on Male black widow spiders are half the size of the female or smaller. http://en.wikipedia.org/wiki/Black_widow_spider

Black widow spider From Wikipedia, the free encyclopedia. For other uses of the name "Black Widow", see Black Widow Black Widow Black Widow spider Scientific classification Kingdom: Animalia Phylum: Arthropoda Class: Arachnida Order: Araneae Family: Theridiidae Genus: Latrodectus Species: L. mactans Binomial name Latrodectus mactans Fabricius The black widow spider Latrodectus mactans ) is a spider notorious for its neurotoxic venom . It is a large widow spider found throughout the world and commonly associated with urban habitats or agricultural areas. Although the common name 'black widow spider' is used to refer specifically to L. mactans it is occasionally also applied to several members of the Latrodectus (widow spider) genus in which there are 31 recognised species including the Australian red-back and brown widow spider . In South Africa the black widow is known as the button spider Adult female black widow spiders are shiny black with an hourglass shape marking on the bottom of its abdomen which, although most commonly red, may range in color from white to yellow to various shades of orange and red. In some varieties, the two halves of the hourglass shape may be separated into two separate dots. Female black widow spiders are about 1.5 inches (38 mm) counting legspan. The body is about 0.5 inches (13 mm). Male black widow spiders are half the size of the female or smaller. They have longer legs and a smaller abdomen in relation to their body size. They are also usually dark brown with yellow stripes and a yellow hourglass mark. Juvenile black widow spiders are usually brown with yellow stripes and a yellow hourglass mark. Adult males can be distinguished from juvenile females by their more-slender body, longer legs and large

46. Black Widow Spiders Learn about the black widow spider, one of hundreds of pests Western Exterminator controls at commercial locations nationwide and in California, http://www.west-ext.com/black_widow_spider.html

Black widow spider Lactrodectus spp. Class: Arachnida Order: Araneae Family: Theridiidae Click to enlarge Size Characteristics Color Where found ... Control Size: Black widow spider adult female is about 1/2 in (12-13 mm) long, including the abdomen which is 1/4-3/8 in (7.2-9.6 mm) in diameter; length including legs is 1 1/2 to 1 3/8 in (38-43 mm); male is half that size. Characteristics: The abdomen is almost spherical. The common name comes from the belief that the female eats the male after mating, which rarely happens in nature. Color: Females are usually black, sometimes brownish, with 2 reddish triangular markings on her underside that are often joined so they look like an hourglass shape, but are sometimes only a single triangular mark. There are usually red markings above the spinnerets. Males usually have a color pattern on upper surface, a row of red spots with white lines or bars going out to the sides. Eyes: 8, with 2 side pairs almost touching. Last tarsal segment of 4th pair of legs has toothed bristles; claws on all lower leg segments. Young spiders are orange and white, becoming more and more black with age, with markings like males on upper side; also 1 or 2 reddish markings on underneath side. Where found: Around the world; 5 species in the United States. Lactrodectus hesperus, the western widow spider, is found in the western U.S. and western Canada.

47. Potentially Dangerous Spiders This species is one of the three closely related black widows. black widow spiders are shy and prefer secluded locations such as crawl spaces, attics, http://www.extension.umn.edu/distribution/naturalresources/DD6962.html

FS-06962 1997 To Order Ames, Iowa Pm-1721 Potentially Dangerous Spiders Phil Pellitteri, Donald Lewis and Jeffrey Hahn Most people are aware that spiders are very beneficial because they eat insects, still there is much confusion and unwarranted fear of the potential harm spiders might do to people. Spiders rank just behind bees and wasps as the most feared arthropod. It is common for any unexplained skin irritation to be called a "spider bite." Spider Bites Research has shown that over 80% of suspected "spider bites" are caused by other arthropods, such as insects and ticks, or other disease states. Of the more than 3,000 kinds of spiders in the United States, about 60 species have been implicated as causing medically significant bites to people. Many spiders are not capable of breaking the skin with their fangs while other species contain venom that causes no reaction. Spiders are usually very timid and will only bite in self-defense if mishandled, cornered, or injured. Even when they bite, spiders do not always inject venom. The severity of the reaction to a spider bite will differ among individuals. Most spider bites are less painful than a bee sting. Actual spider bites show two puncture marks although the wound is not always obvious. A rather typical reaction may involve localized reddening and various degrees of swelling, itching, and pain. Within a few hours a small red, blue, or black discoloration can develop around the bite site. The area may remain tender for a few days, and eventually a small sore can develop that soon begins healing. Accurate identification of any spider bite can only be made if the spider causing the bite is captured and identified.

48. CCHS Clinical Digital Library See also. Black Widow Spider Bites Clinical Resources black widow spiders Access document A Black Widow Spider Bit Me! Access document http://cchs-dl.slis.ua.edu/patientinfo/emergency/conditions/bites/spider/widow-s

Patient/Family Resources by Topic: Emergency Medicine Black Widow Spider Bites Patient/Family Resources Pediatrics Spanish Miscellaneous See also: Black Widow Spider Bites Clinical Resources Arizona Poison and Drug Information Center: Homepage Venomous Critters Table of contents Black Widow Spiders Access document MedlinePlus Medical Encyclopedia: Table of contents Black Widow Spider: English Spanish Merck Manual - Second Home Edition Table of contents Section 24. Accidents and Injuries: Table of contents Chapter 298. Bites and Stings: Table of contents Introduction: Access document Spider Bites: Access document Pediatrics MD Consult: Homepage Health Sciences Library subscription INFO Patient Handouts Table of content Spider and Scorpion Bites (Pediatric Version): English Spanish KidsHealth (Nemours Foundation): Homepage Health Information for Kids: Table of contents Everyday Illnesses and Injuries: List of documents Hey! A Black Widow Spider Bit Me!: Access document Health Information for Parents: Table of contents First Aid and Safety: List of documents Insect Stings and Bites: Access document Spanish MD Consult: Homepage Health Sciences Library subscription INFO Patient Handouts Table of content Spider and Scorpion Bites (Pediatric Version): English Spanish MedlinePlus Medical Encyclopedia: Table of contents Black Widow Spider: English Spanish Miscellaneous Spider Bites Patient/Family Resources Healthfinder (US DHHS): Homepage Insect/Bee Sting: List of documents MedlinePlus (National Library of Medicine) Health Topics: Index Insect Bites and Stings:

49. Erowid Black Widow Vault Information about black widow spiders plus links. black widow spiders are Webs are extremely strong and springy. BASICS EFFECTS IMAGES HEALTH LAW http://www.erowid.org/animals/blackwidow/blackwidow.shtml

Become an Erowid member and get a one-year subscription to Erowid Extracts Path : animals Black Widow Spiders BOTANICAL CLASSIFICATION Family : Theridiidae Genus : Latrodectus Species : mactans COMMON NAMES Black Widow Spider EFFECTS CLASSIFICATION Poisonous DESCRIPTION Black Widow spiders are ... Webs are extremely strong and springy. OFF-SITE RESOURCES PRIMARY RESOURCES Answers.com : Black Widow Spider SECONDARY RESOURCES Black Widow Spiders Overview Black Widow Spiders back to animals PlaceMenu("footer") Created by Erowid - Unknown Last Mod - Apr 19, 2005

50. Home Garden: Reduce Areas Where Black Widows Can Hide black widow spiders are intriguing, with the wellrecognized red There is one black widow spider currently living in the upper-right-hand corner of my http://www.fresnobee.com/lifestyle/hg/story/10947941p-11714640c.html

Search Archives or Search News Search Local Return to normal layout E-mail Print Subscribe to print ... postCount('/lifestyle/hg/story/10947941p-11714640c.html'); Reduce areas where black widows can hide By Pam Geisel (Updated Saturday, July 23, 2005, 6:50 AM) Black widow spiders are intriguing, with the well-recognized red hourglass on their abdomens, and their shiny black bodies. If I happen to feel the distinct sticky nature of their webs while digging around in the garden, it frightens me and makes me back away from the web. On the other hand, if I actually see the spider, I like to watch it. They are interesting in their repulsiveness. There is one black widow spider currently living in the upper-right-hand corner of my sliding glass door. She wanders around between the screen and the door at night doing what she does best, which is eating other insects. For that reason, I just can't kill her. However, I know that if I see an egg sac, I will immediately remove it. Its bite can be poisonous, but its fangs are so tiny that they can't break through all layers of skin. They are also less distinctive in color, which is a patterned cream and dark brown. Female black widow spiders are the most common harmful spiders in California. The venom from a bite can cause a variety of symptoms from very mild to painful and serious. However, death from a black widow bite is very rare. If you are bitten, medical attention can usually alleviate any problems.

51. Black Widow Spiders All about black widow spiders. blackwidow spider (5393 bytes). Black Widow Theridiidia Cobweb Weaver Spider. By Nancy Zuschlag, Colorado State http://www.colostate.edu/Depts/CoopExt/4DMG/Garden/Amazing/blackwid.htm

Black Widow Theridiidia : Cobweb Weaver Spider By Nancy Zuschlag, Colorado State University Cooperative Extension The concept of a male-dominated society has yet to reach the world of the Black Widow spider. In Widow society, the female is the aggressor. Though Black Widow bites occur infrequently, it's usually the female who does the biting by using her large fangs. To reduce the possibility of injury, Black Widow bites require immediate medical attention. One reason the male Widow seldom bites is its size: It is smaller than the female and does not possess large enough fangs to penetrate the skin. The female Widow spider's aggressive nature is true but may be overstated. Courtship begins when the male touches the female. Eventually the male walks over the female and surrounds her in a silk wrap, sometimes called the `bridal veil.' But, if the process loses its charm, the female may interrupt the proceedings and attack the male. Widow spiders are common in much of Colorado. They prefer to nest near the ground in dark, undisturbed areas. Low shrubs can provide nesting areas as can small animal holes or wood piles. Photo: Judy Sedbrook Back to Amazing Facts Back to Gardening Topics Back to Home Ask a Master Gardener ... Equal Opportunity © CSU/Denver County Cooperative Extension Master Gardener 1999-2005 Web pages maintained by Judy Sedbrook, Colorado Master Gardener

52. Black Widow Spiders widow. black widow spiders are very numerous. For the most part, black The body of the female adult black widow spider (northern and southern), can http://knox.tennessee.edu/black_widow_spiders.htm

53. Nearctica - Family - Medical - Spider Bites of the Black Widow Spider, its bite, symptoms, and treatment.......black widow spiders AND BROWN RECLUSE SPIDERS The black widow spider is the http://www.nearctica.com/family/medical/spiders.htm

Medical - Spiders Special Segments Butterflies of North America Conifers of North America Eastern Birds List of N.A. Insects Home Eastern Wildflowers General Topics Natural History Ecology Family Environment Evolution Home Education Home Conservation Geophysics Paleontology Commercial Organizations Return to Medical Main Page BLACK WIDOW SPIDERS AND BROWN RECLUSE SPIDERS - The black widow spider is the most poisonous spider in North America and anyone bitten by one should seek immediate medical treatment and follow the first aid tips in the links listed below. The Black Widow is easily identified by its black body and the red hourglass shaped mark on its abdomen. The brown spiders of the genus Loxosceles (Brown Recluse, Fiddle Spider) are also dangerous, although not as deadily as the Black Widow. The common wolf spider and other non-descript brown spiders are often mistaken for the brown recluse. The symptoms of bites of each of these two spiders and their treatment are given in the links below. You will also find identification tips for both species. Note in particular the violin shaped mark on the thorax of the brown recluse. IPM Alabama . F. Oi and T. Shelton. Description of the Black Widow Spider, its bite, symptoms, and treatment.

54. Black Widow Spider Baseball Jersey > Black Widow Spider > MagentaStudios | CafeP MagentaStudios Black Widow Spider Baseball Jersey black widow spider, black widow spiders, bug, bugs, insect, insects. http://www.cafepress.com/shop/insects/browse/Ne-10036_pv-magentastudios.2768441_

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55. PMRA | Effective Control Of Household Spiders Identify different types of spiders such as the black widow or wolf spider and learn how to control them in the home with chemical pesticides and other means. From the Pest Management Regulatory Agency in Canada. http://www.house-spider.ca/

Contact Us Help Search Canada Site ... Household Spiders Effective Control of Household Spiders Introduction Identification of Household Spiders Preventative Control of Household Spiders Physical Control of Household Spiders ... Chemical Control of Household Spiders Introduction Spiders commonly found in Canadian homes include house spiders, wolf spiders, cellar spiders, fishing spiders and, much more infrequently, black widow spiders. Spiders are usually found in corners of rooms, closets, boxes, dark crevices, basements, garages, and gardens. Spiders are excellent pest controllers. Wolf spiders are especially beneficial to farmers and gardeners because they prey on common crop pests such as cottonworms, gypsy moths and pea aphids. Spiders do not transmit any diseases. Although nearly all spiders have venom glands, they rarely bite humans and only a few species, such as the black widow spider, can have a dangerously venomous bite. Identification of Household Spiders The spider has an unsegmented body with two main divisions, four pairs of walking legs and organs for producing silk which is used for making nests, webs to catch prey or cocoons for its eggs. Spiders can have up to eight eyes. With so many eyes, it is surprising that most spiders are near-sighted. Many spiders prey on pests such as flies, mosquitoes, plant hoppers and gypsy moths that get caught in their webs. Once the prey becomes tangled in the web, the spider immobilizes it by wrapping it in more silk and then injecting venom to paralyze it. Later the spider injects a predigestive liquid and sucks out all the nutrients from its prey. Most spiders are nocturnal, shy, and avoid confrontation by running away. They will only bite if squeezed or held.

56. Widow Spiders Southern black widow Spider, Texas A M University Extension System in association with Texas Cooperative Extension program. Edwards, GB, 2002. http://www.ext.vt.edu/pubs/entomology/444-422/444-422.html

Widow Spiders Authors: Charles Hannum, Jr., Graduate Student and Dini M. Miller, Assistant Professor and Extension Specialist; Department of Entomology; Virginia Tech Publication Number 444-422, Posted January 2005 Table of Contents Class Order Family Species ... Special Thanks Class Arachnida Return to Table of Contents Order Araneae Return to Table of Contents Family Theridiidae, comb-footed or cob weaver spiders Return to Table of Contents Species United States: Red widow, Latrodectus bishopi ; Brown widow, L. geometricus ; Western black widow, L. hesperus ; Southern black widow, L. mactans , and Northern black widow, L. variolus Return to Table of Contents Size Adult females have a body length (cephalothorax and abdomen combined) of approximately 1/2 inch (~1.25 cm) and a total leg span of approximately 1-1/2 inches (~4 cm) (Figure 2). However, there is much variation in female size, particularly gravid (egg-carrying) females. The abdomen of a gravid female can be greater than 1/2 inch (~1.25 cm) in diameter. Males are much smaller, often having a body length less than 1/4 inch ( < 0.75 cm) and a leg span of approximately 1/2 inch (~1.25 cm).

57. Spiders Of Medical Importance (006) (267) University of Nebraska Cooperative Extension in Lancaster County factsheet and audio on local spiders of medical importance (black widow, brown recluse, sac spider, parson spider). http://lancaster.unl.edu/enviro/pest/factsheets/006-94.htm

Top Ten Most Visited Web sites Spiders of Medical Importance by Barb Ogg, Ph.D., Extension Educator updated March 27, 2005 This resource covers medically important spiders: Black Widow Brown Recluse Parson Yellow Sac and "Little Miss Muffet sat on her tuffet, eating her curds and whey; along came a spider, and sat down beside her; and frightened Miss Muffet away." "There was an old lady who swallowed a spider that wiggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die." "'Step into my parlor,'" said the spider to the fly." PRINTABLE With rhymes like these, it is no wonder that many people view spiders with apprehension. And, the movie, "Arachnophobia," did not do much to dispel fears about these eight-legged creatures. There are about 2,000 kinds of spiders in the United States. Of these, only a few species are considered to have bites that are of medical importance. Spiders are very shy creatures. Most people get bitten because they are cleaning an area that has not been cleaned for a long time and they disturb a spider's web or nest. Spiders are often blamed for many more bites than they actually commit. In general, most spider bites will not harm most people except for slight discomfort for a limited time after being bitten. A few individuals may be hypersensitive to the bites of a particular species, but this allergic reaction won't be known until after the person gets bitten.

58. Black Widow Spider Adult Like all spiders, the black widow has 8 legs; however, males and females Life History The black widow spider overwinters as a young adult in http://ipm.ncsu.edu/AG369/notes/black_widow_spider.html

Black Widow Spider Latrodectus mactans (Fabricius), Theridiidae, ARANEAE DESCRIPTION Adult Like all spiders, the black widow has 8 legs; however, males and females differ in appearance. Females are about 40 mm long with legs outstretched and have black, globular abdomens about 9 by 13 mm marked with a red or yellow hourglass shape underneath. Males are lighter in color and have a red or pale brown stripe down the middle of their backs from which white or yellow streaks radiate. Males are smaller (up to 30 mm long with legs outstretched). The male pedipalps (biting appendages at front of head) are noticeably swollen. Egg Eggs are incorporated into grayish, silken balls about 12 to 15 mm in diameter. These egg masses contain 200 to 900 eggs and are found in the spider's web. Nymph Entirely white at first, nymphs develop through five to eight instars. As they develop, nymphs become more similar in appearance to adult males, though smaller. BIOLOGY Distribution Though more abundant in the southern states, the black widow spider occurs throughout most of the Western Hemisphere. This species may hide in sheltered, dimly lit places such as barns, garages, basements, outdoor toilets, hollow stumps, rodent holes, trash, brush, and dense vegetation. Black widows usually seek dry, sheltered sites such as buildings during periods of cold weather. Feeding Habits This spider feeds primarily on insects and other arthropods but, when disturbed, it may bite people or animals.

59. CPCS: Spider Bites Only the female spider is dangerous to humans. What does a black widow The black widow spider is a shiny, inky black spider with a large round tail http://www.calpoison.org/public/spiders.html

Important New Information. Important information on syrup of ipecac Spider bites Black widow spider Brown recluse spider Chronic arachnidism or necrotic arachnidism Jumping spiders ... Daddy longlegs spiders There are at least 50,000 spider species in the arachnid family. Spiders are defined as having eight jointed legs, no wings, no antennae and only two body sections: the thorax and the abdomen. Spiders spend their entire life span capturing and eating other insects (about 2,000 in a year). Even though spiders do a great deal of good for our environment, spiders are greatly feared by most of the population. Most spiders are killed only because they scare people, not because they are actually dangerous to humans. All spiders have some amount of venom with varying degrees of potency. The fangs of a spider are hollow. The venom is injected through the fangs into the victim (usually an insect). The venom will rapidly paralyze the victim and aid in digestion. Fortunately, most spiders are not dangerous to humans because their fangs are either too short or too fragile to penetrate human skin. Spiders do not attack in herds. Spiders do not lay in wait and attack people. Spiders do not lift the covers at night and crawl into bed to bite people as they are sleeping. Some spiders can jump but they are not intentionally jumping at humans to attack them. A spider generally bites a human because it was scared and bites to defend itself. Spiders generally prefer to live in undisturbed areas such as corners of the house or the eaves or in the garden where they can catch insects in peace.

60. Black Widow Spider: Pictures, Information, Classification And More Information on black widow Spider pictures, articles, classification and more. http://www.everythingabout.net/articles/biology/animals/arthropods/arachnids/spi

Black Widow Spider Do you know... that cuckoo wasps lay their eggs in the nests of bees, wasps, and certain other insects? Click here to find out more... Black Widow Spider Photo by: J.A.L. Cooke/Oxford Scientific Films At least three other species found in the United States are also poisonous to humans: the brown, or gray, widow spider; the red widow spider, with irregular red and yellow markings; and the northern widow spider, with a row of red spots above and two red bars on the underside of the abdomen. Scientific classification: Black widow spiders make up the genus Latrodectus in the family Theridiidae. The name is applied especially to the familiar North American species Latrodectus mactans. The brown, or gray, widow spider is classified as Latrodectus geometricus, the red widow spider as Latrodectus bishopi, and the northern widow spider as Latrodectus variolus. HOME ARACHNIDS Spiders General info Reproduction and more Black Widow Spider Brown Recluse Spider Crab Spider Funnelweb Spider Jumping Spider ... Wolf Spider Design by Oleg Kozhukhov "Black Widow Spider," Microsoft® Encarta® Online Encyclopedia 2003

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