Yellow sac spider
The Yellow Sac Spiders (Cheiracanthium inclusum) are rather small pale yellow spiders that take shelter in flattened silk tubes during the day and move about to hunt during the night. Their bites are toxic to humans but rarely produce more than local symptoms. They are believed to produce a high percentage of the spider bites suffered by people, probably because they wander about when people cannot see well or are asleep, and so they may get squeezed and bite to protect themselves.External link to photo:
