Yellow sac spiders, cheiracanthium inclusum, are non-social spiders. They stay away from humans and are usually without other spiders. According to the Western Exterminator Company, sac spiders accidentally end up indoors.
Sac spiders feed off of other spiders. They don’t create webs, instead they hide their sacs behind a shielded area. They usually lay around 30 to 48 eggs and are typically found in gardens or on leaves.
According to Michigan State University, sac spiders lay their eggs in June or July. The spider is a hobbit to man-made structures. They will usually be near buildings, in corners, or in dark places. They want to hide their eggs and themselves from other creatures as much as possible.
The sac spider’s bite is painful. The burning can last up to an hour. The post-bite symptoms such as blisters and swelling can last up to ten hours.
The symptoms are similar to those of a black widow bite but are not quite as severe.
Sac spiders are so small, they can be easily overlooked. Females are about ¼ to ⅜ inches long and males are about 3/16 to 5/16 long.
Sac spiders are commonly mistaken for brown recluse spiders. They both have very long legs, but their color sets them apart. Let’s hope there are none in our new Mountie school store.