Broad-faced Sac Spider
Scientific Name: Trachelas tranquillus
Order & Family: Araneae; Trachelidae
Size: 7 to 10 mm (females); 5 to 6 mm (males)

Natural Habitat
Found outdoors under leaf litter, rocks, or logs; commonly enters homes in the fall to find a warm place to overwinter.
Diet & Feeding
Carnivorous; feeds on other spiders and dead or dying insects.
Behavior Patterns
Night-active hunters that do not build webs for prey capture; instead, they build silken retreats for resting and overwintering.
Risks & Benefits
Provides natural pest control by eating other insects. While their bite can be painful and cause mild localized swelling, they are generally not dangerous to humans unless a secondary infection occurs.
Identified on: 6/23/2026