The Mayflies, Or Ephemeroptera, of Illinois
STATE OF ILLINOIS WILLIAM G. STRATTON, Governor DEPARTMENT OF REGISTRATION AND EDUCATION VERA M. BINKS, Director NATURAL HISTORY SURVEY DIVISION HARLOW B. MILLS, Chief Volume 26 BULLETIN Article 1 The Mayflies, or Ephemeroptera, of Illinois B. D. BURKS Printed by Authority of the State of Illinois URBANA, ILLINOIS May 1953 STATE OF ILLINOIS WILLIAM G. STRATTON, Governor DEPARTMENT OF REGISTRATION AND EDUCATION VERA M. BINKS, Director BOARD OF NATURAL RESOURCES AND CONSERVATION VERA M. BINKS, Chairman A. E. EMERSON, Ph.D., Biology WALTER H. NEWHOUSE, Ph.D., Geology L. H. TIFFANY, Ph.D., Forestry ROBERT H. ANDERSON, B.S.C.E., ROGER ADAMS, Ph.D., D.Sc., Chemistry Engineering GEORGE D. STODDARD, Ph.D., Litt.D., L.H.D., LL.D., President of the University of Illinois DELYTE W. MORRIS, Ph.D., President of Southern Illinois University NATURAL HISTORY SURVEY DIVISION Urbana, Illinois SCIENTIFIC AND TECHNICAL STAFF HARLOW B. MILLS, Ph.D., Chief BESSIE B. EAST, M.S., Assistant to the Chief Section of Economic Entomology Section of Applied Botany and Plant Pathology GEORGE C. DECKER, Ph.D., Entomologist and Head LEO R. TEHON, Ph.D., Botanist and Head J. H. BIGGER, M.S., Entomologist J. CEDRIC CARTER, Ph.D., Plant Pathologist L. L. ENGLISH, Ph.D., Entomologist J. L. FORSBERG, M.S., Associate Plant Pathologist S. C. CHANDLER, B.S., Associate Entomologist PAUL F. HOFFMAN, JR., Ph.D., Associate Plant WILLIS N. BRUCE, Ph.D., Associate Entomologist Pathologist NORMAN C. GANNON, Ph.D., Associate Entomologist G. H. BOEWE, M.S., Assistant Plant Pathologist JOHN M. WRIGHT, Ph.D., Assistant Entomologist RICHARD J.
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