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Published online by Cambridge University Press: 31 May 2012
During the last seven years the writer has taken advantage of every opportunity to study the stoneflies, or Plecoptera, of Illinois. The desire to have this investigation rest upon an understanding of the bionomic and taxonomic relationships of this order in North America as a whole has led to the collection by myself of material in other geographical regions and the examination of specimens collected hy others in various localities.