Currently viewing the category: "Spiders"
What's That Bug? does not endorse extermination

Subject: Pretty spider
Location: Stillwater OK
July 22, 2017 6:07 am
Found this spider in my dining room this morning. I’ve never seen one like this before.
Signature: Angela

Ant Mimic Ground Sac Spider

Dear Angela,
This is one of the Ant Mimic Ground Sac Spiders in the family Corinnidae, and we are confident we have identified is as a species with no common name,
Castianeira amoena, thanks to images on BugGuide.  According to SpiderBytes:  “Some Castianeira species are thought to mimic velvet ants (Mutillidae), rather than ants. Mutillids are not actually ants but wasps, and the females are wingless and brightly coloured, with extremely painful stings. In this case, harmless Castianeira spiders might benefit by looking like the much more dangerous velvet ants, and thus be avoided by predators (this is called Batesian mimicry).”

What's That Bug? does not endorse extermination

Subject: Some pics to share!
Location:  IN USA
July 16, 2017 6:15 pm
Hello Bug Peeps! I thought I’d share some really lovely shots I got of some awesome specimens! You are probably the only people who will appreciate them, heh. The first two are spiders but the final one of a beetle was the best shot of all!

The second is a much better photo of a really pretty spider hanging out on my bathroom wall in Indiana USA. I looked it up and it is a spitting spider and spits a mixture of webbing and venom on its victims, so basically what Spiderman does but also poison which I think is very clever. I like the spots on the legs. I keep my fingers crossed that it will catch and eat the stupid fruit flies that keep getting in my garbage- they fly at my eyes and are annoying.

Signature: KLeigh

Spitting Spider

Dear KLeigh,
Thanks for sending in your image of a Spitting Spider in the family Scytodidae.  Alas, we cannot currently link to BugGuide, but we did find some images on Spiderz Rule! where it states:  “It is called the ‘Spitting Spider’ because it spits a poisonous sticky substance over its prey. Its body size ranges between 3 and 6 mm. They catch their prey by spitting a fluid that immobilizes it by congealing on contact into a venomous and sticky mass. They can be observed swaying from side to side, in order to cover the prey in a crisscrossed “Z” pattern; each of two pores in the chelicerae emits half of the pattern. The spider usually strikes from a distance of 10-20mm and the whole attack sequence is over in a little under 1/700th of second. It is a slow hunter and seems to use special long hearing hairs on its legs to locate its prey. It hunts at night and moves slowly towards its prey. When it is about 10mm away, it stops and carefully measures the distance with one front leg. Then it squeezes the back of its body together and spits two poisonous silk threads in one six-hundredth of a second, in a zigzag manner over the victim. The prey is immediately immobilized. If the prey is big, the spider spits several times.

What's That Bug? does not endorse extermination

Subject: Strange Spider?
Location: Upstate New York
July 11, 2017 9:14 pm
Dear Bugman,
My son and I located what we believe to be some sort of spider weaving a web under our porch light. We were quite curious as to what type of spider it might be. I am thinking some type of Orb Weaver? Any help would be greatly appreciated. So sorry for the quality of the photos, the bug was quite small. Thank you.
Signature: Heather

Cobweb Spider

Dear Heather,
We believe we have correctly identified your spider as a Cobweb Spider in the family Theridiidae, and it is a species without a common name,
Rhomphaea fictilium, thanks to this BugGuide image.  According to BugGuide, it is:  “widely scattered in the U.S., but reportedly rare; also throughout most of Canada.”  We located this interesting information on Spiderbytes:  “As well as having wonderfully strange morphology, Rhomphaea have rather unusual habits. Most spiders are generalist predators, and spiders in the family Theridiidae typically build tangle webs that they use to catch crawling insects and other arthropods, including other spiders. Rhomphaea, unlike most of their relatives, specialize on hunting other spiders. They do sometimes build their own rudimentary webs from just a few silk lines, but they also enter the webs of other spiders and use aggressive mimicry to hunt their owners. Rhomphaea will pluck the web and produce vibrations that lure the resident spider out to investigate what they perceive to be prey caught in the web. The web-building hunter then becomes the hunted, tricked into the approaching the dangerous intruder. Rhomphaea fictilium have been reported to prey on other theridiids, orb-weavers (araneids), sheet-weavers (linyphiids) and others.”

Cobweb Spider

Wonderful!  Thank you so very much for your help.  It was fascinating to read about this spider.
Thank you,

What's That Bug? does not endorse extermination

Subject: Spider Wasp
Location: Near Pittsburgh PA
July 11, 2017 4:51 am
I’m pretty sure this a spider wasp (Pompilidae) of some sort, but I hope that you can tell what variety.
Signature: Terry M

Spider Wasp with Prey

Dear Terry,
Based on BugGuide images, we are pretty confident your Spider Wasp is
Tachypompilus ferrugineus, and of the genus, BugGuide states:  “Adults are often found taking nectar from flowers (Daucus, Pastinaca, and Eryngium). Females provision nests mainly with Lycosids.”  Based on that information, the prey is most likely a Wolf Spider.

What's That Bug? does not endorse extermination

Subject: Is this a Dangerous Spider – Sure looks like it to me
Location: West Los Angeles
July 10, 2017 5:39 pm
Hi Bugman,
As much as I love butterflies, I don’t get along with spiders. Can you please let me know if this one is dangerous?
These are the best pics Icould take, but if you enlarge them the spider is quite visible.
Signature: Jeff Bremer

Brown Widow and Egg Sac

Dear Jeff,
Both the Brown Widow Spider and her egg sac which are pictured in your image are quite recognizable.  According to BugGuide:  “The brown widow is highly variable in color. It may be almost white to almost black. Typically, it is a light to medium brown, with an orange-to-yellow hourglass marking on the underside of the abdomen; the coloration of the hourglass often is a good indication of this species. The leg segments are banded, with one half of each segment lighter in color than the other half. The back often has a row of white spots (rarely orange or light blue), and there are a few white stripes on each side. Darker individuals lack these markings and are difficult to distinguish from black widows. If an eggsac is present, this is the best identifying characteristic. Brown widow eggsacs are tan, spherical, and have many small tufts of silk sticking out from them. They resemble a ‘sandspur.’ The other widows make white, smooth eggsacs that tend to be pear-shaped. ” BugGuide also provides this information:  ” Widow Bites:  NOTE: It is recognized that this particular species of widow is most likely not medically significant (not an immediate medical concern to those who are bitten). The brown widow produces clinical effects similar to that of the black widow but the typical symptoms and signs being milder and tending to be restricted to the bite site and surrounding tissues. (Print Ref 1)  Brown widow spiders usually curl up into a ball, and drop to the ground as a primary defense. It is highly recommended that people leave this spider alone; observe, but don’t touch.  The brown widow is an extremely timid spider which has rarely been reported to bite.”  The Brown Widow is a non-native, introduced species that has gotten quite common in Southern California as well as the entire southern portion of the U.S.

Thanks Daniel,
It’s hard to know when to be worried and when not.

What's That Bug? does not endorse extermination

Subject: What is this spider?
Location: Aiken, SC
July 9, 2017 2:10 pm
I suffer from extreme arachnophobia. My husband sent me this picture of a spider living in our storage building. My first instinct was to tell him to kill it with fire; but cooler heads prevailed and he just left it alone. I’m afraid that it is venomous and will have lots of little venomous babies in our building and the building and everything in it will have to be transferred to the ownership of the spider.
Signature: Arachnophobe Angie

Wolf Spider

Dear Angie,
This is a Wolf Spider, and we suppose it would make no difference to an arachnophobe, but Wolf Spiders are not considered dangerous to humans.  They are hunting spiders that do not build webs, so it is doubtful it will remain in one location very long.

Thank you so much for your reply! Although I am still terrified of it, it’s great to know it’s not actually a danger.
Thank you again!
What's That Bug? does not endorse extermination