Illinois data suggest that 29% of all stonefly species have been extirpated. Glaciated areas of the state have experienced the greatest losses. Areas of similar land form in the Midwest, USA, may also be affected. Sampling, museum specimens, and verifiable literature records will aid in determining extinctions, range losses, and shifts in species composition across the region. Results to date demonstrate losses of species in the flattest till and glacial lake plain areas, whereas drift plains with sandy soils and ample groundwater discharge still maintain sensitive species. The authors will ask for help from the ESA community in gathering specimens for this long-term effort.