Bug Identifier
False widow spider
Community identification

False widow spider

Steatoda grossa (likely)

Order & Family
Araneae; Theridiidae (cobweb spiders)
Size
Adult females typically 6–10 mm in body length; males are smaller and slimmer.
See this bug in the Encyclopedia

Natural Habitat

Common indoors and around buildings, especially in sheltered corners, window frames, sheds, and garages; native to warmer regions but widely introduced.

Diet & Feeding

Predatory, capturing flies, mosquitoes, ants, and other small arthropods in a tangled cobweb.

Behavior Patterns

Mostly nocturnal and sedentary; it retreats when disturbed and can remain in the same web for long periods. Females produce several silk egg sacs and may live for multiple years.

Risks & Benefits

Its bite is uncommon and usually causes localized pain, redness, or swelling; medically serious effects are rare. It is beneficial as a household pest predator.