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

Subject:  Unexpected Roomates
Geographic location of the bug:  Ventura, Ca
Date: 01/10/2019
Time: 10:01 PM EDT
Your letter to the bugman:  Dearest Bugman,
I recently changed my residence and have noticed quite a few additional spiders in my new space. I assumed that the majority of what I see are ‘daddy long legs’ (please excuse my potential misuse of this street name for what I believe are harmless/helpful creatures that pose no threat to the likes of me). However, today I spotted something totally different. Mostly ‘white’/ translucent with what appear to be ‘black shoes’ on each foot. Please let me know who my new roommate is.
How you want your letter signed:  Melanie on the Irish Chain

Yellow Sac Spider

Dear Melanie,
The “daddy long legs” that you mentioned are most likely Long Bodied Cellar Spiders which we identified for you in the past.  Your current request appears to be a Yellow Sac Spider or Black Footed Spider,
Cheiracanthium mildei, which is pictured on BugGuide where it states:  “More often found inside man-made structures” and “Sac spiders are classified as hunting spiders. These spiders are very active at night and will emerge from their day resting sacs to run along walls and ceilings in pursuit of prey. If startled, they drop down on draglines and scurry away!  Imported from Europe in the 1940s.”   This is not considered a dangerous species to humans, but BugGuide does note:  “Yellow sac spider bites occur most frequently when the very defensive spider is trapped in clothing.”  Charles Hogue calls this species a Cream House Spider.

I tried to respond via the website but wasn’t able to figure it out.
My response was going to be something to the tune of… if getting trapped in clothing is problematic for these spiders than I will plan on wearing much less when I am at home.

What's That Bug? does not endorse extermination

Subject: Which spider?
Location: Anaheim,California
May 2, 2016 8:34 pm
Can you identify this spider for me. Sorry it’s not the clearest (I know, another one of those), but your best guess would be helpful. It was in my kitchen this morning and it’s the first time I’ve ever seen one near or in my house.
Found today, May2nd, 2016, in Anaheim, California. We live in an urban neighborhood, house built in the 60s. 64 degrees out, clear cool day.
Signature: Huh? “You’re the greatest”, “All my love”… Lol. Not sure what you mean, you pick.

Black Footed Spider

Black Footed Spider

Generally, the signature line in our standard form is used so that folks may use their real name or some funny phrase for those who want to maintain internet anonymity.  This is a Black Footed Spider or Yellow Sac Spider, Cheiracanthium mildei, based on this BugGuide image.  According to BugGuide, it is  “More often found inside man-made structures.”

What's That Bug? does not endorse extermination

Subject: Please ID spider
Location: Plattsburgh, NY
April 24, 2016 11:31 am
Trying to ID this critter.
Signature: Luke T. Bush

Sac Spider

Sac Spider

Dear Luke
Based on this and other BugGuide images, we believe this is a Sac Spider in the genus
Cheiracanthium.  According to BugGuide:  “Some species are thought to be slightly dangerous. However, this may not be true.”

What's That Bug? does not endorse extermination

Spider
Location: SE lower Michigan
December 27, 2010 2:20 pm
Can you help me identify this spider? We have spotted them a few in our home.
Signature: H. Smith

Black Footed Spider

Dear H. Smith,
Your spider is a Black Footed Spider or Yellow Sac Spider,
Cheiracanthium mildei, a species that was introduced from Europe.  It was once believed to be a species whose bite could cause necropsy around the bite, but that speculation is no longer believed.  The revision can be read about on the American Journal of Tropical Medicine and Hygiene website.

Thank you so much for taking a look at it.
We really do appreciate this awesome service to those of us out here that have no clue as to how to identify these things.

What's That Bug? does not endorse extermination

What kind of spider is this?
December 17, 2009
I keep finding these little spiders in my house, specifically in my bathroom. They seem to like to be on the ceiling above the shower and I always freak out when I see one while I’m in there because I don’t know what kind of spider it is and whether or not they are of any danger to me. They are usually about the size of a nickel and very pale in color. Can you tell me what kind of spider this is and a little bit about it please?
Jessica
Providence RI

Yellow Sac Spider

Yellow Sac Spider

Dear Jessica,
This species that has been introduced from the Mediterranean, Cheiracanthium mildei, is known by several common names, including Yellow Sac Spider, Black Footed Spider, and Cream House Spider.  The spider will bite, most often when it is trapped in clothing.  It was once believed that the bite of the Yellow Sac Spider was associated with blisters and lesions, but this has not proven to be the case, and the species should be removed from the medical concern list according to BugGuide.  You may read more on the ASTMH website of the American Journal of Tropical Medicine and Hygiene.

What's That Bug? does not endorse extermination