Broad-faced Sac Spider

Scientific Name: Trachelas tranquillus

Order & Family: Araneae, Corinnidae

Size: Females 7-10 mm; Males 5-8 mm

Broad-faced Sac Spider

Natural Habitat

Typically found outdoors in gardens, under rocks, leaf litter, and bark. Can also be found indoors, especially in basements and ground-level rooms.

Diet & Feeding

Primarily preys on smaller insects and other arthropods. They are active hunters rather than web-builders for prey capture.

Behavior Patterns

Nocturnal hunters. They do not build typical webs for catching prey, but rather construct silken sacs or retreats in sheltered locations during the day. They are known for their fast movements.

Risks & Benefits

Generally considered harmless to humans, though their bite can be mildly painful, similar to a bee sting, resulting in localized swelling or redness. They are beneficial as they prey on various pest insects.

Identified on: 9/17/2025