Common Spiders Found in Illinois

Illinois has over 500 species of spiders. Many of these make their homes outside, with just a few being found indoors. Most spiders in Illinois are not dangerous, but it is good to know some common types in order to identify if a spider is deadly.

Orb Weavers

Orb weavers, commonly found outdoors in Illinois, have webs in places like barns. These spiders rarely bite, but if they do, the bite is comparable to a bee sting.

Wolf Spider

A wolf spider is distinctive because of its inch-long body paired with two-inch legs. It is generally black, and can be found beneath logs or rocks. Its bite is uncommon and not dangerous.

Brown Recluse

The brown recluse is the size of a quarter and has a violin shape behind its eyes. It may be found in boxes. The bite is dangerous in only about 10 percent of cases.

Cobweb Spider

Cobweb spiders may be found in a basement or garage. Most are not dangerous, with the exception of the black widow, whose bite may require medical treatment.

Woodlouse Spider

The woodlouse spider may be found under rocks and logs. It is identified by its dark front and gray back. This spider may bite as a defense, but the pain goes away quickly.

References

• Illinois Department of Public Health

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