Description: Papers of William Patrick Hayes (1887-1970), professor of Entomology (1924-1955), including correspondence relating to Hexpoecia (University Entomological Organization, 1912-1935), European Corn Borer reports (1933), the Illinois State Natural History Survey (1930-1934), and Entomological Society of America (1947-1950); research notes on European Corn Borer and other insects; taxonomic notes on larvae and insects; notes for entomology courses and lectures; drawings and photographs of insect anatomy; professional publications by Hayes and manuscripts on insect taxonomy and economic entomology and published entomology material (by others). Correspondents include Clell L. Metcalf, William J. Schoene, and Paul S. Welch.