The brown recluse spider  has a violin shape on its head segment with the neck of the violin pointing toward the abdomen.  It has six eyes arranged in pairs, with one pair in front and a pair on either side of the head.  Both male and female are venomous, however the spiders are very timid.  Its body is not more than 3/8″ long.  Both the legs and the abdomen are uniformly colored.  The recluse is named aptly; it retreats during the day, emerging at night to search for food.  They do not build webs, but do use silk to build their retreats.  They are found in cracks, crevices and under rocks, trash cans, tarps, etc.  Keeping your environment neat and uncluttered will act to prevent their occurrence.

Brown Recluse Spider | Organic Pest Control