Five families and 140 species of spiders not included in former Illinois checklists are recorded. Two of these families, Antrodiaetidae and Scytodidae, and 40 of the species have been cited in earlier revisionary or other literature. The families Oonopidae, Symphytognathidae (slat.) and Ctenidae, and the remaining 100 species of spiders are recorded from Illinois for the first time. Locality data are given as counties only, and months of capture of mature specimens are presented. The total known spider fauna of Illinois now stands at 500 species in 27 families.
Beatty, J. A. and Nelson, J. M.
"Additions to the Checklist of the Illinois Spiders,"
The Great Lakes Entomologist, vol 12
Available at: https://scholar.valpo.edu/tgle/vol12/iss1/9