Bug Identifier
False Black Widow
Community identification

False Black Widow

Steatoda grossa

Order & Family
Araneae: Theridiidae
Size
Females range from 6 to 10.5 mm in body length; males are smaller at 4 to 6 mm.
See this bug in the Encyclopedia

Natural Habitat

Commonly found in and around human dwellings, basements, crawl spaces, and dark corners of gardens or sheds.

Diet & Feeding

Carnivorous; feeds on a variety of crawling insects, including woodlice, crickets, and occasionally other spiders.

Behavior Patterns

They are nocturnal cobweb-weaving spiders that hang upside-down in irregular webs. They have poor eyesight and rely on vibrations to locate prey.

Risks & Benefits

Generally beneficial for pest control as they eat common household insects. While they can bite humans if handled, their venom is not medically significant like a true black widow, typically causing localized pain and minor swelling.