Identifying spiders black widow,body louse and head louse,pest control methods home,getting rid of dog ticks in house - Step 3

Category: How To Get Rid Of Crickets | 04.11.2014
How to identify (and misidentify) Brown Widow The brown widow spider, Latrodectus geometricus, is not native to the United States.
Newly emerged spiderlingsOnce the babies emerge from the egg sac, things get a little confusing. Where the problem comes inThe problem with properly identifying mature brown widows from immature western black widows comes when the spiders are about half grown. As western black widows mature, they develop more dark pigment in the background area, the stripes start to break up into nebulous isolated patches and eventually disappear as the spider continues to molt and adds darker pigment on its way to turning completely black. The brown widow can have some orange in that longitudinal stripe but it will never be bright red. Brown widow abdomens showing lighter colors (upper left), orange in longitudinal stripe and very pale blotches at the top of the diagonal stripes (upper right), a dark abdomen with very dark blotches on top of the diagonal stripes (lower left) and a strange one with orange tint all over (lower right). Immature western black widow abdomens showing typical tan background with orange-red longitudinal stripe (left), showing a bit darker background coloration but the small black dots on top of the white diagonal stripes are barely visible, notice how the central longitudinal stripe undulates slightly and the orange stripe pinches off at places (center), and another darkening specimen where the central red longitudinal stripe is now breaking up into individual spots. On the front facing portion of the brown widow abdomen (left), the light colored lines do not converge in the middle whereas in the immature black widow (right), the line is continuous. Adult femalesMany sources will tell you that a brown widow is tan and has an orange hourglass. Western black widow femalesOf course, the familiar pattern of the black widow is very striking and looks nothing like the baby that emerged from the egg sac. MalesMales of both species are smaller than the females but the brown widow males are much smaller than black widow males. Size comparisonsBelow are pictures of male and female brown and western black widows taken with the same scale so their sizes can be compared. Believing these spiders to be black widows, my options have been either to be very attentive while around the worm bin–or to roll out the vacuum. The thing about these spiders is that they lack the identifying spots on their abdomens, but I remembered being told somewhere that not all types show the red marks, and that males never do.
Not all adult black widows exhibit the red hourglass on the ventrum underside or top of the abdomen — some may have a pair of red spots or have no marking at all.
But then on the handy page Frequently Encountered Spiders in California, I learned about the False black widow. Another European invasive, this spider seems to be displacing our native black widows in urban areas. The spiders in my box are pretty shy, but insofar as I can tell, they are all sort of an eggplant color–not that true, bad-ass black of a classic widow.
Not to scare you too much (I like the idea of a false black widow too), but we live in the SoCal area and have lots of Brown Widows.
Black widows will have a non-sticky strong web, do not live in colonies (very territorial), and do not like to be far away from the ground.
I live in Oklahoma far from all of you but I read where you said black widows stay close to the ground. For those who think spiders don’t bite or know of no one bitten by a spider, I know of someone who was bitten by a brown recluse. I had previously noticed red markings, so after some research we concluded they were brown widows. I’ve never done any real research but I do find unmistakable Black Widow spiders around my house with some frequency.
What I’ve heard is that the toxic spiders of whatever variety will weave a chaotic web.
When I was 7, my family moved to the Okanagan and someone told me that they had black widow spiders. I generally have a no kill policy when it comes to spiders but the widow family means I bust out the shop van without guilt.


I live in san clemente and recently bit by brown widow on my leg while laying on my patio furniture watching sunset.
Found this post because we just adopted a worm bin from someone living on the other side of the island (Oahu) and there are at least 5 of these same spiders living around the lid and the cardboard I put in the bin.
In females, abdomen is usually purplish-brown with pale markings, though the adults eventually turn completely dark-colored (sometimes all black) which causes them to be mistaken for real black widows. The egg sac of the brown widow is round and yellow with many little silk spikes sticking out from its surface, looking like a big pollen grain or one of those harbor mines from World War II. Although the brown widow may look a little bit like the adult that it is going to grow up to be, the western black widow looks NOTHING like a black widow female.
Below will be a series of pictures of brown widows then black widows to show you the great variation in each species as they mature. I like spiders and all they do around the garden, and have a no kill policy toward them in general.
Female black widows often exhibit various red markings on the dorsal or top side of the abdomen, commonly two red spots.
However, my trouble are not over, because it turns out that they do have a venomous bite, apparently somewhat like a mild black widow bite. I had an infestation of black widows at my old house (killed about a dozen over approx 2 years) but the only ones I have ever seen have been super shiny black with the red hourglass on their underside or two red spots on their back. But now, looking at your pic, I wonder if all of ours actually have the telltale red marking…body wise, our spiders look like your pic. We’ve read that they are not as dangerous, and conversely, just a dangerous as the black ones.
The next day, the spiders were back at work, having made new webs and catching more insects.
I did not sleep the first night there, moving from room to room, imagining black widows crawling in to my sleeping bag to kill me.
When viewed from the front, arranged in two horizontal rows of four (a pattern typical of cobweb spiders in the family Theridiidae). Our current understanding of each spider's distribution is drawn from numerous scientific publications and online spider submissions, in order to be as accurate as possible. The silk is not sticky but prey easily gets tangled and begins to struggle, which sends vibrations to the spider. It is possible that this spider is a specialist on “pillbugs” (aka “woodlice”; “roly-polies”), probably because both the spider and the pillbugs usually live near the ground and are both nocturnally active. If you are a spider photographer, you can submit pictures of spiders to help fill any voids in our ever expanding library.
The egg sac of the western black widow is either round or pointed at the top, yellow and smooth. Baby western black widows have tan legs, tan cephalothorax with a black longitudinal stripe and a white abdomen with black spots.
In the brown widow, it looks something like a finger of a hand projecting upward and the finger is holding a large black rectangular blotch.
However, black widow young are believed to have at least some sort of marking on their abdomens.
They are not black at all, but they do most certainly still have the red markings on the underside of their abdomen.
I do agree with Andrea about the spiders, but I would take or send the spider in for identification to a county extension office. We have black widows and brown widows (or at least, the brown widow egg cases, so I assume the spiders are here somewhere).
In our experience, black widows like very dry environments, so unless your worm bin is very dry, I wouldn’t expect to find them there.


It is important to remember that spiders do not adhere to the territorial lines decided on by humans, therefore these ranges are subject to change. Although these two baby spiders look somewhat alike, the brown widow babies have more brown on them.
Compare that to the immature western black widow and you see that the light colored stripe is more of a straight line or may be flattened a little at the top.
Also notice that the forwardmost dot in the brown widow is isolated from the rest of the stripe and is about twice as wide as long. Adult male black widows are half the size of the females, and are usually gray or brown rather than black and red; while they may sometimes have an hourglass marking on their ventral abdomen, it is usually yellow or white, not red.
As both species of spiders grow bigger from babies, the abdomen background turns darker colors and stripes appear on the abdomen.
The same place that would have the dot on the immature western black widow is continuous with the stripe (at least in the early stages of life).
Variation in specifics by species and by gender is great; any spider exhibiting a red hourglass or a pair of large red round spots on the ventral abdomen with an otherwise black shiny body is an adult female black widow. In fact the Widow I am holding in my hand right now along with her egg case was found on the ground today in a pile of discarded wood. Black widows build super strong webs (almost like fishing line)-that’s how we initially ID them. Unfortunately, immatures of the native black widow spider, Latrodectus hesperus, also are tan with white stripes and are frequently mistaken for brown widows. It isn’t quite as bad as a black widow but it is much worse than our other venomous spider in Alabama the brown recluse! Neither I nor my wife have any fear of spiders because we know that they are not going to bite. Also, female black widows will be a very glossy dark black, not a muted brown like the one in your picture. After the eggs hatch, the spiderlings are white and rubbery (this is true for all spiders). Field Guide to the Spiders of California and the Pacific Coast States (California Natural History Guides). In 45 years I have never had a person who claimed to have been bitten able to describe the spider to me because not one of them ever actually saw the spider. Immature and male black widows look altogether different from the classic black widow momma shape. Black Widow Spiders: Venomous!Wood piles and tree stumps -- that's where venomous female black widows hide. She is long-legged and glossy black, with a distinctive orange, red, or yellow "hourglass" shape on her underside. Black Widow Spider BitesBlack widow spider bites may cause stabbing pain in the bite area, but they can also be painless. Brown Recluse Spiders Can Have a Nasty BiteHiding in attics and closets -- in Midwestern and Southern states -- that's where you'll find brown recluse spiders. Brown Recluse Spider BitesWhen the brown recluse bites, it is often painless -- then skin may redden, turn white, blister, and becomes painful.



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