Sac Spider

Scientific Name: Cheiracanthium spp.

Order & Family: Araneae: Cheiracanthiidae

Size: 5 to 10 mm (approximately 1/4 to 3/8 inch) in body length.

Sac Spider

Natural Habitat

Typically found in foliage, tall grasses, under stones, or inside houses near ceilings and corners.

Diet & Feeding

Carnivorous; they hunt small insects and other spiders at night.

Behavior Patterns

Nocturnal hunters that do not build webs for catching prey, but instead build silk retreats or sacs for resting during the day.

Risks & Benefits

Benefits include controlling indoor and garden pests; however, their bite can be painful and may cause localized swelling or skin irritation, though they are generally not considered dangerous.

Identified on: 5/11/2026