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Sac Spiders

Sac Spiders make small cylindrical or ovoid silk retreat sacs. They have slender bodies, large jaws and long, thin legs, with the males being especially slender. Most are shades of cream, brown or yellow, with a darker stripe along the upper abdomen. The jaws of the male spider are particularly enlarged.


sac spiders

Sac Spider

This Sac Spiders have stronger legs with robust, cylindrical bodies, reddish-brown to fawn in colour, often with chevron patterning on abdomen.


At night, sac spiders actively hunt their prey—usually small insects. In search of prey, they run quickly waving their forelegs before them. Indoors, they can be observed on walls and ceilings, but drop to the floor to seek cover when disturbed. 


Sac spiders construct a silken tube or sac in a protected area, such as within a leaf, under landscape timbers or logs, or at the junction of a wall and ceiling, and they use this sac as their daytime retreat. This is how the sac spider gets its name. These spiders do not build webs.


They only measure about 9 mm - 15 mm long.


Yellow sac spider

Yellow Sac Spider

A common house species, the yellow sac spider is pale greenish, tan or straw colored. Other sac spiders are light brown.


Sac spiders typically have darker mouthparts and a faint dark stripe running lengthwise down the abdomen.


Normally, these are outdoor spiders, but sac spiders often invade structures. Their numbers increase significantly in the fall when the weather turns cool and their food supply disappears. If there are small insects available, sac spiders can become established indoors.


After mating, females lay 30 to 48 eggs and cover them in a thin coat of loosely spun silk. The small, white, paper-like sacs are often found in easily overlooked locations, along ceilings and corners, or behind pictures and shelves. The female may guard these egg sacs and may produce several egg masses during her lifetime.


Inspect for sac spiders by looking for sacs in upper corners of rooms, ceilings, behind pictures, on window molding, blinds or curtains. During the day, sac spiders may be inside these sacs so vacuuming is an excellent method of spider pest control. Remove and discard vacuum cleaner bags to prevent reinfestation.


If you have any questions about pest control check out the rest of our website or go to our blog at http://nypestpro.blogspot.com.


Beyond Pest Control.

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