1. Black Widow Spiders - DesertUSA All about black widow spiders, includes color photos, scientific names, common names, description, behavior, range, habitats and life cycle. http://www.desertusa.com/july97/du_bwindow.html

Black Widow Spiders Latrodectus hesperus Black Widow Spiders Genus: Latrodectus Phylum: Arthropoda Sub Phylum: Chelicerata Class: Arachnida Order: Araneae Sub Order: Labidognatha Family: Therididae Species: BlackWidow spiders inhabit most warmer regions of the world to latitude of about 45 degrees N. and S. They occur throughout all 4 deserts of the American Southwest. Related Species Widow spiders (Genus Latrodectus) are the best known and largest of the Cobweb Weavers (Family Therididae). All widows are venomous. Black Widows comprise about 6 species and inhabit most warmer regions of the world to a latitude of about 45 degrees N. The species L. hesperus is common in the western US and is the Black Widow found in the North American deserts. L. mactans is the Black Widow common in the eastern and central US. The Brown Widow Spider, L. geometricus, is also found in the US. L. mactans is found in most warm areas of the world

2. Black Widow Spider Black Widow Spider. HABITAT black widow spiders are common around wood piles, and are frequently encountered when homeowners carry firewood into the house. http://www.ext.vt.edu/departments/entomology/factsheets/blackwid.html

3. Black Widow Spiders black widow spiders. How do black widow spiders get their name? Females black widow spiders are shiny black when full grown. Since the females commonly eat their mate after mating (as do many other http://cecalaveras.ucdavis.edu/bwidow.htm

4. Black Widow Spider, Spiders, Black Widow, SPIDERS, BLACK WIDOW SPIDERS, Spider E Black Widow Spider. black widow spiders are common around wood piles, and are frequently encountered when homeowners carry firewood into the house. http://www.pestproducts.com/blackwid.htm

Pest Control Pests Products Items ... pest control Black Widow Spider BIOLOGY OF SPIDERS SPIDER ELIMINATION Araneae: Theridiidae, Latrodectus mactans The female black widow spider rarely leaves her web. The web she constructs is an irregular, tangled, cris Egg sacs are pear shaped (or oval), brown, papery and about ½ inch long. They hold from 25 to 900 or more eggs, which have an incubation period of 20 days. The spiderlings disperse shortly after emerging, tearing an opening in the egg sac and stay near the sac. After several hours, these second instar spiderlings balloon to the ground and scatter. Growth requires two to three months, with older females dying in autumn after egg laying. Of all spiders, the Black Widow is the most feared. The female’s venom is especially poisonous to people. Despite its reputation, this spider often attempts to escape rather than bite, unless it is guarding an egg mass or if it is cornered and pressed. The male black widow will not bite you. After mating, the female sometimes eats the male (remember, she only has to mate once in her life), earning the name "widow." During the period shortly following mating and laying of eggs, the female black widow can be a little cranky and hungry. After this period (if he lives through it!) the male lives quite comfortably, eating prey captured by the female. The development of his venom sacs stop and become inactive as the male matures, thus making him less of a potential problem than his female counterpart.

5. Black Widow Spiders And Other Spiders Of Medical Importance Brief information on the black widow and brown recluse; links to related web sites. http://members.tripod.com/~LouCaru/index-13.html

Black Widow Spiders and Other Spiders of Medical Importance Web Gateway For Links on The Widow Spiders The Black Widow So beautiful, so filled with wonder You have class with the Arachnids Latrodectus mactans is your scientific name Your venomous bite is what gives your fame Beware of her sting, she'll get you on the arm Fall not for her false lustrous black charm Avoid her at all costs, don't get to close Her neurotoxin will take your breath away For then they may be doing your post. The widow spiders belong to the genus Latrodectus . There are five species found in North America north of Mexico. The “black widow” for many years was considered to be a single species but since is now recognized to be represented by three species, which are very similar in appearance and habitat. These three widow spiders are the Southern black widow Latrodectus mactans (Fabricius), the Western black widow L. hesperus L. variolus (Walckenaer). The widow spiders are the most notorious of all spiders. L. geometricus

6. Black Widow Spiders And Black Widow Spider Pictures Specializing in black widow spiders, Do It Yourself Pest Control provides the products and expertise you need for residential and commercial control of spiders. black widow spiders. Black Widow http://www.doyourownpestcontrol.com/black_widow_spider.htm

Black Widow Spiders Black Widow Spider Identification, Habits, Recommended Measures of Control Black Widow Spiders Information Search DIYPC Information Vault HOME TIPS PRODUCT CATALOG QUESTIONS/ANSWERS-FAQ'S Click Image To Go Directly To The DIYPC Store for Pest Control Products Free shipping on all orders in the U.S.A. (Except the states of Alaska and Hawaii) Feel free to call 1-800-476-3368 if you have any questions! Black Widow Spider Pictures for Identification Black Widow Spider Habits Black Widow Spider Bites Recommended Measures for Control for Black Widow Spiders Black Widow Spiders are considered venomous spiders in North America. Black Widow spiders are not usually deadly, especially to adults, because they inject only a small amount of venom. Despite its reputation, this spider often attempts to escape rather than bite, unless it is guarding an egg mass or if it is cornered and pressed. After mating, the female sometimes eats the male, earning the name "widow." IDENTIFICATION FEMALE BLACK WIDOW The female black widow spider is the most easily recognized, her shiny black body giving great contrast to the red hourglass marking on her round abdomen.

7. Hardin MD : Black Widow Spider Bites / Pictures From the University of Iowa's Hardin MD, Internet sources on Black Widow Spider Bites / Pictures. 2004 pictures black widow bites, black widow bites pictures, photos of black widow spiders, black widow spider pictures, pictures of http://www.lib.uiowa.edu/hardin/md/blackwidow.html

Black Widow Spider Bites / Pictures A Hardin MD Just Plain Links Page Return to Hardin MD : Home Allergies +Pictures Brown Recluse Spiders +Pictures Bubonic Plague +Pictures Chiggers +Pictures Flea Bites +Pictures Head Lice +Pictures Insect Bites Pictures Lyme Disease Pictures ... Spider Bites +Pictures Black widow spiders and other spiders of medical importance Directory Louis B. Caruana, Southwest Texas State Univ LookSmart : Guides to the black widow spider Directory Yahoo : Widow spiders Directory Black widow spider (Includes spider bite symptoms California poison control system Black widow spider William F. Lyon, Ohio State University extension fact sheet Black widow spiders in the low desert Maricopa county cooperative extension, California MEDLINEplus Health Encyclopedia : Black widow spider Symptoms A.D.A.M. / National Library of Medicine Black widow spiders DesertUSA.com Black widow spider Eric Day, Virginia cooperative extension All links on this page hand-checked 5.4.04

8. Black Widow Spider black widow spiders. The Black Widow spider (Latrodectus) is represented by five species in North America north of Mexico. Two of these species, the brown widow (L. geostricus) and the redlegged or http://kaston.transy.edu/widow.html

Black Widow Spiders The Black Widow spider ( Latrodectus ) is represented by five species in North America north of Mexico. Two of these species, the brown widow ( L. geostricus ) and the red-legged or red widow ( L. bishopi ), are restricted to a southern distribution. The red widow appears to be found only in southern Florida. The remaining black widow species were historically considered to be only one species but are now recognized as three distinct species . Identification is based upon the pattern of red coloration on the underside of their abdomen and by their geographical distribution, although the northern and southern black widows may coexist in some states. The Venom Although almost all spider species possess poison only a few species produce a venom virulent to be harmful to humans. Black widows are very timid spiders and are not known to agressively bite humans. However, the venom of black widows is a neurotoxin and it may interfere with the nerve impulses to muscle tissue. After being biten from a black widow one may feel painful rigidity in the muscles of the abdomen and a feeling of tightness in the chest. Other symptoms include an increase in blood pressure, a rise in body temperature, nausea, and sweating. Death is uncommon (less than 1% of the reported cases), but in the elderly or very young death may occur from asphyxia 14-32 hours after being bitten. Seek medical attention if you suspect you have been bitten. Without medical attention the symptoms can last 5 days and a complete recovery may take weeks.

9. Black Widow Spider, HYG-2061A-04 Fema. Adult black widow spiders have shiny, jet black, rounded, globular abdomens with two reddish or yellowish triangles on the underside which form a http://ohioline.osu.edu/hyg-fact/2000/2061A.html

Ohio State University Extension Fact Sheet Entomology 1991 Kenny Road, Columbus, OH 43210-1000 Black Widow Spider HYG-2061A-04 Susan C. Jones, Ph.D. Assistant Professor of Entomology Female black widow spider with egg sac. Class: Arachnida Order: Araneae Family: Theridiidae Common Name Scientific Name black widow spider Latrodectus mactans Species in the genus Latrodectus are commonly known as widow spiders. A number of different species of widow spiders occur in the United States. The black widow spider ( L. mactans ) and the northern black widow spider ( L. variolus ) occur in Ohio, although both are relatively uncommon, especially in the northern half of the state. Other species of widow spiders occasionally arrive in shipments of household goods. The black widow spider has a potent neurotoxic venom and is considered the most venomous spider in North America. However, the female injects such a small dose of venom that it rarely causes death. Reports indicate human mortality at well less than 1% from black widow spider bites. Identification The adult female black widow spider has a shiny, jet black, spherical abdomen with two connected red triangles on the underside that form a characteristic hourglass marking. Note, however, that the hourglass color may range from yellowish to various shades of orange or red. Adult females are about 1/2-inch long, not including the legs (about 1-1/2 inches when legs are spread). Adult males are harmless, about half the female’s size, with smaller bodies and longer legs. The male’s abdomen usually has red spots along the upper midline and white lines or bars radiating out to the sides. Newly hatched spiderlings are predominately white or yellowish-white, gradually acquiring more black and varying amounts of red and white with each molt. Juveniles of both sexes resemble the male and are harmless.

10. Arachnaform Auto Accessories Shift Knobs Imported car shifter knobs with genuine Australian black widow spiders encased inside in a life like stance. http://www.spidershiftknobs.com/

Imported shifter knobs with genuine Australian Black Widow Spiders encased inside in a life-like stance! Only $32.95 + $7.00 for S/H! Fits all makes and models. 100% money back guarantee (including shipping) if you are not fully satisfied! (See Policy Here) Coolest auto accessories yet!! Totally unique!! Bound to create attention!! Generate interesting comments!! Hosting and Development by Blue 105

11. Black Widow Spiders black widow spiders are common in the Southwestern Deserts. Here are the facts you need to know about these venomous spiders. black widow spiders can be found in all four deserts of the American http://phoenix.about.com/cs/desert/a/spider.htm

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Phoenix, AZ Shopping, Services, Media About Phoenix Articles ... 4th of July Fireworks zau(256,152,180,'gob','http://z.about.com/5/ad/go.htm?gs='+gs,''); Attractions and Events Food and Drink Sports and Recreation Moving to Phoenix ... Help zau(256,138,125,'el','http://z.about.com/0/ip/417/0.htm','');w(xb+xb); Stay Current Subscribe to the About Phoenix, AZ newsletter. Search Phoenix, AZ Black Widow Spider Black Widow Spider Email to a friend Print this page Stay Current Subscribe to the About Phoenix, AZ newsletter. Suggested Reading Scorpions Rattlesnakes Killer Bees Other Black Widow Sites Spiders, from About Black Widow Spider Tattoos Recent Discussions Summer car safety What's your fav BBQ joint? Just what are you going to do? Most Popular Tattoo Photo Gallery Movie Theaters - Harkins Theaters - AMC Theaters - Movies Tribal Sun Tattoo Picture Sun Tattoo Picture ... A to Z Site Index What's Hot Best Places to Work: 2003 First Friday in Phoenix Urban Villages of Phoenix Phoenix Event Calendar - June ... Best Restaurants For Kids Black Widow Spiders From Judy Hedding Your Guide to Phoenix, AZ

12. Black Widow Spider- EnchantedLearning.com black widow spiders are extremely poisonous arachnids. They black widow spiders are extremely poisonous arachnids (not insects). Their http://www.enchantedlearning.com/subjects/arachnids/spider/Blackwidowprintout.sh

EnchantedLearning.com is a user-supported site. As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages. Click here to learn more. (Already a member? Click here. EnchantedLearning.com Animal Printouts Label Me! Printouts Black Widow Spiders are extremely poisonous arachnids (not insects). Their venom is 15 times as poisonous as the venom of the prairie rattlesnake . These venomous spiders are found in warm and temperate climates all around the world. They live in dark places, in drain pipes, under logs and rocks, etc. in North America from Florida and California to southern Canada. Their bite rarely kills humans. The female will sometimes eat the smaller male after mating. She will lay 300-400 eggs. The spiderlings (baby spiders) are not poisonous but they are cannibals, eating each other. Diet : Black Widows eat flies, moths, crickets, small reptiles and other small animals. Their fangs inject venom and digestive juices into the prey. This kills the prey and also liquifies its flesh, letting the spider eat it easily. Anatomy : Females (about 1 1/2 inches across) have a black body with a distinctive red hourglass shape on the underside of the abdomen. Males are smaller (about 3/4 inch across) with longer legs and red and yellow markings. The females are much more poisonous than the males. Black Widows have a two-part body, strong jaws, poisonous fangs, and a hard exoskeleton.

13. Black Widow Spider, HYG-2061A-04 The black widow spider is found primarily in the southern Ohio counties whereas the northern widow spider is found in the northern Ohio counties. Fema Adult black widow spiders have shiny, jet black, rounded, globular abdomens with two reddish or yellowish Adult female northern widow spiders are shiny black or brownblack with two http://www.ag.ohio-state.edu/~ohioline/hyg-fact/2000/2061A.html

Ohio State University Extension Fact Sheet Entomology 1991 Kenny Road, Columbus, OH 43210-1000 Black Widow Spider HYG-2061A-04 Susan C. Jones, Ph.D. Assistant Professor of Entomology Female black widow spider with egg sac. Class: Arachnida Order: Araneae Family: Theridiidae Common Name Scientific Name black widow spider Latrodectus mactans Species in the genus Latrodectus are commonly known as widow spiders. A number of different species of widow spiders occur in the United States. The black widow spider ( L. mactans ) and the northern black widow spider ( L. variolus ) occur in Ohio, although both are relatively uncommon, especially in the northern half of the state. Other species of widow spiders occasionally arrive in shipments of household goods. The black widow spider has a potent neurotoxic venom and is considered the most venomous spider in North America. However, the female injects such a small dose of venom that it rarely causes death. Reports indicate human mortality at well less than 1% from black widow spider bites. Identification The adult female black widow spider has a shiny, jet black, spherical abdomen with two connected red triangles on the underside that form a characteristic hourglass marking. Note, however, that the hourglass color may range from yellowish to various shades of orange or red. Adult females are about 1/2-inch long, not including the legs (about 1-1/2 inches when legs are spread). Adult males are harmless, about half the female’s size, with smaller bodies and longer legs. The male’s abdomen usually has red spots along the upper midline and white lines or bars radiating out to the sides. Newly hatched spiderlings are predominately white or yellowish-white, gradually acquiring more black and varying amounts of red and white with each molt. Juveniles of both sexes resemble the male and are harmless.

14. Black Widow Spiders And Other Spiders Of Medical Importance This Web site is devoted to the Black Widow Spider and other spiders of medical importance. A description, illustrations, and medical information is provided on this page either by meta links or http://www.webring.org/go?ring=spider;id=58;go

15. Black Widow Spiders In The Low Desert Landscaping in the Low Desert black widow spiders (TheridiidaeLactrodectus sp.) in the Low Desert. DESCRIPTION The adult female http://ag.arizona.edu/maricopa/garden/html/t-tips/bugs/widow.htm

Maricopa County Cooperative Extension Home Horticulture: Environmentally Responsible Black Widow Spiders (Theridiidae:Lactrodectus sp.) in the Low Desert DESCRIPTION: The adult female is glossy black with a bright orange to red hourglass shaped marking on the underside of her abdomen. When mature she measures 1 1/2 inches with legs extended. The males also have the red hourglass marking but are cream and tan in color and much smaller in size. Newly hatched black widows are white with black spots on their abdomens with a cream colored hourglass. Later as they mature they become cream and brown-striped. The black widow requires about 4 months from egg to maturity with the females going through six to nine molts. Over their one to two year life span the females produce several egg sacs, each containing several hundred eggs. Female black widows guard the sac, which resembles a silken cocoon, until the eggs hatch. During this time she is most likely to bite when threatened. Eggs are most frequently encountered from May to October. All stages of both sexes are venomous. Even the egg sacs contain poison.

16. Urban IPM: Spiders: Black Widow Spiders Urban Integrated Pest Management. Black Widow Spiders. The University of Arizona. Warning The bite of a black widow spider can be lifethreatening. http://ag.arizona.edu/urbanipm/spiders/blackwidows.html

Urban Integrated Pest Management "Black Widow" Spiders From: R.L. Smith, 1982. Venomous Animals of Arizona. The University of Arizona. Warning: The bite of a "black widow" spider can be life-threatening. If you or someone in your care has been bitten by a "black widow" spider, obtain professional medical assistance as soon as possible. No emergency first aid procedures are recommended for "black widow" spider bites (see first aid instructions Description: The common name black widow spider specifically belongs to the eastern species Latrodectus mactans , which does not occur in Arizona. Latrodectus hesperus , our species, is very similar to the true black widow. The adult female has a shiny black (occasionally dark brown) body approximately 1.5 cm long and slim black legs with a span of about 4 cm. The most famous and easily distinguishable characteristic of this species is the bright red hourglass-shaped marking on the underside of the bulbous female abdomen (Figure 11). Immature females have red, brown, and cream-colored markings on the dorsal surface of the abdomen (Figure 12), and a cream-colored hourglass. Males are much smaller than adult females (about 1/20 the size) and, like immature females, are patterned with red, brown, and cream (Figure 13). Figure 11. Adult female "black widow" spider

17. Black Widow Spider BIOLOGY Female black widow spiders deposit their eggs in silken egg sacs which are about 3/81/2 (9.25-12 mm) in diameter, can be constructed in 1-3 hours http://personalwebs.myriad.net/bugboy/blackwid.htm

Black Widow Spider INTRODUCTION: These spiders get their common name from the popular belief that the female eats the male after mating, a phenomenon which rarely happens in nature. The genus Latrodectus is worldwide in distribution, with 5 species occurring in the United States. Recognition of the genus is sufficient for PCO purposes. RECOGNITION: Young spiders primarily orange and white but acquire more and more black as they mature, with markings very similar to those of males. With 1 or 2 reddish markings on underneath side of abdomen. REPRESENTATIVE SPECIES: Identification to species is left to experts since several species are involved and species separation is based primarily on differences in the male gentalia. Although a very brief description based on female coloration is given below, it must be realized that color and markings are not always reliable characteristics for separation of these species and that males are usually colored and marked quite differently. 1. Latrodectus bishopi Kaston, the red widow. Cephalothorax reddish, abdomen black with reddish to organish spots outlined by white, red marks on venter, and legs reddish; occurs only in central and southern Florida. 2. Latrodectus geometicus (Fabricius), the brown widow. Color brownish with white and black brown markings, abdomen with red hourglass mark, legs banded/ringed; occurs only in southern Florida.

18. Hey! A Black Widow Spider Bit Me! black widow spiders and their relatives can be found almost anywhere in the Western hemisphere of the world in damp and dark places. http://kidshealth.org/kid/ill_injure/aches/black_widow.html

KidsHealth Kids What a Black Widow Spider Is The black widow spider is one of six poisonous kinds of spiders in the United States. It is part of the arachnid family, which includes not just spiders, but ticks , mites, and scorpions , too. Its body is about one-half inch long (smaller than a dime), and it has long legs. The black widow spider is shiny and black with a red-orange or yellow mark in the shape of an hourglass on its stomach. Black widow spiders and their relatives can be found almost anywhere in the Western hemisphere of the world in damp and dark places. Their favorite places are wood piles, tree stumps, trash piles, storage sheds, fruit and vegetable gardens, in stone walls, and under rocks. If they come inside, they will go to dark places like corners of closets, garages, or behind furniture. They are shy by nature and bite only when trapped, sat on, or accidentally touched. Printer -friendly version Email this article to a friend Send email to us Jump to another section of this article Hey! A Black Widow Spider Bit Me!

19. Hey! A Black Widow Spider Bit Me! What a Doctor Will Do Doctors treat people who have been bitten by black widow spiders with medications to help relax the muscles and reduce pain. http://kidshealth.org/kid/ill_injure/aches/black_widow_p3.html

KidsHealth Kids What a Doctor Will Do Doctors treat people who have been bitten by black widow spiders with medications to help relax the muscles and reduce pain. They sometimes give antivenin, a medication that fights the venom in the spider's bite, if someone who has been bitten has underlying medical problems or doesn't get better from the other medications. How to Avoid Getting Bitten The best way to avoid getting bitten by black widow spiders is to be careful in areas where they like to spend time. Don't play around in rock piles or wood piles. If you are working outside in the yard in big piles of logs or leaves, wear gloves. Be sure to shake out blankets and clothing that have been stored in the attic or the basement, or if they have been in a closet but not used for a long time. If you are cleaning behind furniture, look carefully behind it before reaching around. If you keep your shoes in a mudroom or garage, shake them out before putting them on. Reviewed by: Kim Rutherford, MD

20. Elementary Theme Pages By Jim Cornish This site is for P and E students/teachers and lists Web resources on black widow spiders. Elementary Theme Pages black widow spiders, http://www.stemnet.nf.ca/CITE/spidersblack.htm

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