Sac Spider (Trachelas spp.)
Detailing the physical features, habits, territorial reach and other identifying qualities of the Sac Spider.
Updated: 2/3/2014; Authored By Staff Writer; Content ©www.InsectIdentification.org
Sac Spiders should be a good incentive to keep up with the laundry. They like to hide in the clothes and will bite their way out if they have to.
When it comes to catching prey, Sac Spiders are predatory hunters, not web weavers. They use their spider silk to weave tent-like sacs between leaves or on tree trunks for retreats though. Sac Spiders are fast runners. They may appear tan, yellowish or even slightly greenish. Only 8 native species inhabit North America.
The group of various Sac Spiders are known to deliver painful bites to humans. These spiders are not outright aggressive, but if threatened, they bite defensively. Because they are wanderers, they sometimes rest in a pile of clothes (clean or dirty) that have been left on the floor. When someone moves it, or puts on something from the pile, the Sac Spider may get trapped between the clothing and the person's skin and bite him/her to escape.
Like all spiders (except Cribellate Orbweavers), they produce a venom designed to immobilize their insect prey. While their venom is not seriously dangerous like a Brown Recluse's or Black Widow's, Sac Spider bites are slow to heal. It is not uncommon for the bite area to get infected as victims frequently scratch or touch it.