Grass spiders

(Agelenopsis spp.)

grass spider (Agelenopsis sp.)

Overview

Agelenopsis is a genus of funnel weaver spiiders. They are called grass spiders because their conspicuous webs are often seen in grass. There are fourteen currrently recognized species of grass spiders. All occur in North America north of Mexico. At least three species occur in Minnesota.

Grass spiders are found in woodlands and grassy areas, low in bushes, in stone piles and gardens, and in corners of buildings, both outdoors and indoors.

Like all spiders, grass spiders are venomous, but they are not harmful to humans.

Description

Females are to (10 to 17 mm) in length not including the legs. Males are just a little smaller, to (9 to 15 mm) long.

The top of the front segment (carapace) has 3 pale and 2 dark horizontal stripes. Like other funnel-web spiders, the spinnerets extend well beyond the end of the rear segment (abdomen), and are visible from above.

The web is a horizontal, non-sticky sheet with a funnel near one edge or in the middle.

Distribution

Distribution Map

 

Sources

7, 24, 29, 30, 82, 83.

12/2/2025    

Taxonomy

Class

Arachnida (Arachnids)

Order

Araneae (Spiders)

Suborder

Araneomorphae (Typical Spiders)

Infraorder

Entelegynae

Zoosection

RTA clade (RTA Clade Spiders)

Zoosubsection

Marronoid (Meshweavers and Allies)

Family

Agelenidae (Funnel Weavers)

Subfamily

Ageleninae (Typical Funnel Weavers)

Subordinate Taxa

eastern funnelweb spider (Agelenopsis naevia)

Emerton’s funnelweb spider (Agelenopsis emertoni)

funnelweb spider (Agelenopsis aleenae)

funnelweb spider (Agelenopsis riechertae)

Kaston’s funnelweb spider (Agelenopsis kastoni)

long stylet funnelweb spider (Agelenopsis longistyla)

Oklahoma funnelweb spider (Agelenopsis oklahoma)

Oregon funnelweb spider (Agelenopsis oregonensis)

Pennsylvania funnelweb spider (Agelenopsis pennsylvanica)

Potter’s grass spider (Agelenopsis potteri)

spatulate funnelweb spider (Agelenopsis spatula)

truncated grass funnelweaver (Agelenopsis actuosa)

Utah funnelweb spider (Agelenopsis utahana)

western funnelweb spider (Agelenopsis aperta)

Synonyms

Agalenopsis

Common Names

grass spiders

 

 

 

 

 

 

Glossary

Carapace

On spiders, the top of the cephalothorax.

 

Cephalothorax

The front part of a spider’s body, composed of the head region and the thoracic area. Eyes, legs, and antennae are attached to this part.

 

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grass spider (Agelenopsis sp.)

Justin B.

Hello!

My name is Justin, and I live in SE WI with my wife, Amy. I happened to see some information you have online about grass spiders, and I knew you would be the place to reach out to.

In the fall, a friend of my mom's called me over to remove a grass spider and her egg sac on her patio table umbrella (she knows I'm an animal lover and protector, haha, and I'm thankful she called me instead of killing her, which is sadly what most would do). I delicately brought her and her egg sac back to my house, and I gave them shelter in a wooden block with a just-big-enough hollowed out tunnel in the middle.

She ran right to her babies and covered them, which was touching to see (attached a picture). This was in September. I considered bring her in, but I knew she'd want to be by her babies, and I knew her lifecycle was predetermined. However, I will wanted to try to help her as much as I could. I wrapped the wood block in roadside insulating blanket wraps, I kept them in a larger outdoor shelter wrapped in tarps, and I tried to give her water using a cotton ball.

I went out today to change her water cotton ball, and sadly, she was gone 😔 And most touching, she even died with one appendage on top of her babies, which, truthfully caused me to tear up. I was actually just tonight going to order a heating pad to put underneath the wood block.

I know about the lifecycle, and I know she probably outlived expectations, but in the back of my mind, I just wonder if there was more I could have done. This is why I wanted to contact - is there a scenario through which I could've helped her survive even longer, or was it just a foregone conclusion no matter what I tried? I suppose at the very least, I got her a few extra weeks with her babies 😢 I will certainly leave them outside in the same protected area and check on them regularly. The least I can do is ensure all her babies get a safe start to their lives in the spring.

Like you, I have a deep appreciation for all of God's creation, even the tiny things that most people fear irrationally like spiders (I always protect them where possible). Thank you for what you do,for bringing awareness, and for caring about that which society has seemed to unfairly cast out. God Bless!

Mary Jo Reuter

Below are the pictures that accompany the report I sent separately from these pictures. Inbetween my mobile home windows. Lindstrom Mn October 15. Thought it was a Brown Recluse at first until taking a better picture to identify it was not the “violin” on the cephathorax (sp?!). Please let me know otherwise if not grass spider as I have to take my AC unit out tomorrow!! Thanks

It is about 3/4” body with the main part that has two black parts with a white stripe down the middle, the abdomen is dark grayish. Has very long legs, two antennas next to the weird eyes. The legs look translucent except it has dark markings on the legs also. I sent three pictures to this email address also today.

Please I would appreciate if this is not a grass spider to let me know asap, as I have to take out my AC units and have the window edges taped up heavily because I don’t want that coming into my house!! I am deathly afraid of spiders and may have to move if that comes in until it is found!!

At first I thought this was a brown recluse because I could not see close enough if that was a violin on its main part. But today I was finally able to shoot a picture and zoom in enough to see it did not appear to be a violin and was thankful that it was not a brown recluse...from my uneducated guess.

grass spider (Agelenopsis sp.)   grass spider (Agelenopsis sp.)
     
grass spider (Agelenopsis sp.)    
     

Any suggestions how to get him out as it will probably run right into the seam where the window and window frame meet. His fangs are about 1/8th “ as I was able to get a good picture of those last night.

grass spider (Agelenopsis sp.)   grass spider (Agelenopsis sp.)

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grass spider (Agelenopsis sp.)   grass spider (Agelenopsis sp.)
     
grass spider (Agelenopsis sp.)    

 

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Other Videos

American Grass Spider facts: the harmless funnel weavers | Animal Fact Files
Animal Fact Files

About

Mar 4, 2020

American grass spiders are often known as the spiders who enter our homes as the season begins to get cold. Sometimes they're mistaken for spiders who pack more of a punch when they bite a human because grass spiders construct webs in the same way these other spiders do, but grass spiders are considered harmless. They may also be known as funnel weaver spiders due to the shape of their webs. A grass spider can move fast and uses its lightning speed to catch prey that has fallen into its web.

Scientific Name: Genus - Agelenopsis
Range: Canada to Mexico
Size: more than an inch (2.54cm) including their legs
Diet: insects and other arthropods and invertebrates
Lifespan: Less than a year

Grass Spider (Agelenidae: Agelenopsis) on Nest
Carl Barrentine

About

Aug 5, 2010

Photographed at Turtle River State Park, North Dakota (04 August 2010).

Agelenopsis "species" Funnel Web Weaver feeding
Ron's Spiders

About

Jul 26, 2018

I just caught this spider yesterday and was going to wait a few days for some webbing to happen before feeding it. By the time someone asked me to record this, I was already in the process of doing it. These spiders are very, very fast. Cool little guys.

 

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Justin B.
12/1/2025

grass spider (Agelenopsis sp.)

Location: SE WI

Hello!

My name is Justin, and I live in SE WI with my wife, Amy. I happened to see some information you have online about grass spiders, and I knew you would be the place to reach out to.

In the fall, a friend of my mom's called me over to remove a grass spider and her egg sac on her patio table umbrella (she knows I'm an animal lover and protector, haha, and I'm thankful she called me instead of killing her, which is sadly what most would do). I delicately brought her and her egg sac back to my house, and I gave them shelter in a wooden block with a just-big-enough hollowed out tunnel in the middle.

She ran right to her babies and covered them, which was touching to see (attached a picture). This was in September. I considered bring her in, but I knew she'd want to be by her babies, and I knew her lifecycle was predetermined. However, I will wanted to try to help her as much as I could. I wrapped the wood block in roadside insulating blanket wraps, I kept them in a larger outdoor shelter wrapped in tarps, and I tried to give her water using a cotton ball.

I went out today to change her water cotton ball, and sadly, she was gone 😔 And most touching, she even died with one appendage on top of her babies, which, truthfully caused me to tear up. I was actually just tonight going to order a heating pad to put underneath the wood block.

I know about the lifecycle, and I know she probably outlived expectations, but in the back of my mind, I just wonder if there was more I could have done. This is why I wanted to contact - is there a scenario through which I could've helped her survive even longer, or was it just a foregone conclusion no matter what I tried? I suppose at the very least, I got her a few extra weeks with her babies 😢 I will certainly leave them outside in the same protected area and check on them regularly. The least I can do is ensure all her babies get a safe start to their lives in the spring.

Like you, I have a deep appreciation for all of God's creation, even the tiny things that most people fear irrationally like spiders (I always protect them where possible). Thank you for what you do,for bringing awareness, and for caring about that which society has seemed to unfairly cast out. God Bless!

John Valo
12/2/2025

Justin.

As you suggested, if she lived outdoors in Wisconsin, her life cycle was predetermined. Grass spiders do not survive the harsh winters in Minnesota or the somewhat milder winters in southeastern Wisconsin. Short of moving the entire block indoors in a terrarium, giving her a source of water and an occasional feeding of a live or recently deceased insect, there was little you could do to extend her life through the winter.

You can take comfort in knowing that you extended her life a little, and you are protecting her eggs from predators, harsh weather, and accidental destruction by humans.

Mary Jo Reuter
10/16/2021

grass spider (Agelenopsis sp.)

Location: Lindstrom, MN, Chisago County

Any suggestions how to get him out as it will probably run right into the seam where the window and window frame meet. His fangs are about 1/8th “ as I was able to get a good picture of those last night.

John Valo
10/16/2021

My suggestion not to remove your AC unit was just to say that the spider was not a danger to you. I wouldn't want a spider this size to spend the winter in my house either.

Mary Jo Reuter
10/15/2021

grass spider (Agelenopsis sp.)

Location: Inbetween my windows, Lindstrom, MN/Chisago County. My AC unit

It is about 3/4” body with the main part that has two black parts with a white stripe down the middle, the abdomen is dark grayish. Has very long legs, two antennas next to the weird eyes. The legs look translucent except it has dark markings on the legs also. I sent three pictures to this email address also today.

Please I would appreciate if this is not a grass spider to let me know asap, as I have to take out my AC units and have the window edges taped up heavily because I don’t want that coming into my house!! I am deathly afraid of spiders and may have to move if that comes in until it is found!!

At first I thought this was a brown recluse because I could not see close enough if that was a violin on its main part. But today I was finally able to shoot a picture and zoom in enough to see it did not appear to be a violin and was thankful that it was not a brown recluse...from my uneducated guess.

John Valo
10/15/2021

It is not a brown recluse, as you noted.

Wolf spiders and grass spiders looks similar, but wolf spiders don't make webs. This is a grass spider. I will look closer tomorrow to see if I can determine the species. In the meantime, don't take out your AC unit. Here is information from Smith's Pest Management:

While grass spiders are not poisonous, they (like all spiders) are venomous. In most cases, their venom is not a risk to people. Instead of biting unsuspecting gardeners, grass spiders use their venom to subdue prey. Grass spiders have very small fangs that cannot generally puncture human skin. Aug 27, 2021

 

 

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