There are, literally, thousands of spider species in the United States. However, only few of these species are poisonous to humans, and only few of them are located in the St Charles MO area. Other kinds of spiders may bite humans and pets, and cause swelling and itching, but unless the victim is allergic, there is no lasting damage. However, the three most poisonous ones are common, and found all across the country.
Black Widow Spiders
Brown Recluse Spiders
The brown recluse spider is often called the “violin spider” or “fiddle-back” because of the violin shape located behind its head. This spider is between ¼ and ½ inch long, with long legs on the front. In keeping with its name, this reclusive species prefers the dark areas in sheds, closets, and garages for its breeding grounds. They will also crawl into garment bags or shoe boxes.
The bite of the brown recluse is extremely toxic, and is in the same family of poisons as snake venom. Victims bitten by a brown recluse may experience vomiting and fever. The bite area may become crusty and red, with a deep hole beneath the scab. This hole can take months to heal, and may become infected and experience tissue death. If you or a pet have been bitten by a brown recluse, you should immediately get medical treatment.