Broad-faced Sac Spider
Scientific Name: Trachelas tranquillus
Order & Family: Araneae, Corinnidae
Size: Females 7-10 mm; Males 5-8 mm

Natural Habitat
Typically found outdoors under bark, stones, and leaf litter, but often enters homes and other buildings, especially in cooler weather.
Diet & Feeding
Predatory, feeding on various small insects and other arthropods.
Behavior Patterns
Nocturnal hunters, they do not build webs for catching prey, but rather actively stalk and subdue their victims. They spin silken sacs or tubes for resting and egg-laying.
Risks & Benefits
Their bite is considered medically significant, though not typically severe. Bites are often painful, causing localized redness, swelling, and itching, and can sometimes lead to a small lesion or blister. They are generally beneficial as predators of other insects. They pose a mild risk to humans due to their defensive bite when threatened.
Identified on: 11/12/2025