Spiders in Illinois

Illinois has over 500 spider species out of which only 30 to 35 of them are seen on a regular basis. The brown recluse and the northern black widow stand among the deadliest of the lot. In fact, the brown recluse inhabits the whole of northern and southern Illinois.

Common spiders: Brown Recluse (Loxosceles reclusa), Orchard Orb-weaver (Leucauge venusta), Tan Jumping (Platycryptus undatus)

Largest spiders: Family of Wolf (Lycosidae) and Fishing (Dolomedes) spiders

Spiders in Illinois Identification Chart

Highly Venomous Spiders

Cobweb (Theridiidae)


  • Brown Recluse (Loxosceles reclusa)

Less Venomous Spiders

Orb-weaver (Araneidae)

Jumping (Salticidae)

Cobweb (Theridiidae)

Nursery Web (Pisauridae)

Crab (Thomisidae)

Spitting (Scytodidae)

  • Scytodes thoracica

Wolf (Lycosidae)

  • Tigrosa georgicola
  • Tigrosa helluo
  • Rustic Wolf (Trochosa ruricola)