STATE OF ILLINOIS 

 William G. Siratton. Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 

 Vera M. Binks, Dire, lor 



BOARD OF NATURAL RESOURCES AND CONSERVATION 

 Vera M. Binks, Chairman 



A. E. Emerson. Ph.D.. BioloRV Walter H. Newhouse. Ph.D.. CeoloRv 



L. H. Tiffany, Ph.D., Forestry Roger Adams, Ph.D., D.Sc. Chemisirv 



Rouert H. Anderson, B.S.C.E., Engineering. 



Lloyd Morey. B.A.. B.Mus., CP.A., LL.D.. D.Sc, President of the University of Illinois 



Delyte W. Morris, Ph.D.. President of Southern Illinois University 



NATURAL HISTORY SURVEY DIVISION 



Urbana, Illinois 



SCIENTIFIC AM) TKCHMCAL STAFF 



HARLOW B. MILLS, Ph.D.. Chief 

 Bessie B. East. M.S.. Assistant to the Chief 



Section of Economic Entomology 



Georce C. Deckkr, Ph.D., Enlomoloaist and 



Head 

 J. H. Bicger. M.S., Entomologist 

 L. L. English. Ph.D.. Entomologist 

 S. C. Chandler. B.S.. Associate Entomologist 

 Willis N. Bruce, Ph.D.. Associate Entomologist 

 Norman C. Gannon. Ph.D.. Associate Ento- 

 mologist 

 John M. Wricht, Ph.D.. Associate Entomologist 

 Paul StrRANYi, Ph.D.. Associate Entomologist 

 W. H. LucKMANN, M.S., Associate Entomologist 

 Ronald H. Meyek. B.S.. Assistant Entomologist 

 John W. Matteson, B.A., Field Assistant 

 Robert Sneisinger, M.S., Field Assistant 

 Sue E. Watkins. Technical Assistant 

 H. B. Pktty, Ph.D.. Extension Specialist in En- 

 tomology* 

 Stevenson Moore, III, Ph.D., Extension Spe- 

 cialist in Entomology* 

 John Arthur Lowe, B.S.. Research Assistant* 

 Mohan Rao. M.S.. Research Assistant* 

 Clarence E. White. B.S., Research Assistant* 

 Louise Zingrone, B.S,. Research Assistant* 



Section of Faunistlc Surveys and Insect 

 Identification 



H. H. Ross, Ph.D., Systematic Entomologist and 



Head 

 Milton W. Sanderson. Ph.D.. Taxonomist 

 Lewis J. Stannard, Jr., Ph.D.. Associate Tax- 

 onomist 

 Philip W. Smith, Ph.D.. Associate Taxonomist 

 Leonora K. Gloyd, M.S.. Assistant Taxonomist 

 Thomas E. Moore, M.S.. Technical Assistant 

 Barbara Gutowsky, M.A., Technical Assistant 



Section of Aquatic Biolotly 



George W. Bennett, Ph.D., Aquatic Biologist 



and Head 

 William C. Starrett. Ph.D., Aquatic Biologist 

 R. W. Larimore. Ph.D., Associate Aquatic Bi- 

 ologist 

 Donald F. Hansen, Ph.D., Assistant Aquatic 



Biologist 

 Robert D. Crompton. Field Assistant 

 Leonard Durham. M.S., Research Assistant* 

 William F. Childers. B.S., Technical Assistant *' 



Section of \pplieil llolimy anti Phiiit 

 i*atholt)iiy 



J. Cedric Carter. Ph.D., Plant Palhalogisl ami 



Head 

 J. L. Fohsbekg. Ph.D., Plant Pathologist 

 G. H. BoKWK. M.S., Associate Botanist 

 R. J. Campana, Ph.D.. Assistant Plant Pathol- 

 ogist 

 I. R. Schneider, Ph.D., Assistant Plattl Pa- 

 thologist 



E. B. HiMELiCK, M.S., Assistant Plant Patholo- 

 gist 



Robert A. Evers. Ph.D., Assistant Botanist 

 RovENiA F. Fitz-Gerald, B.A., Technical 



Assistant 

 James D. Bilbruck. M.S., Research Assistant* 



Secthm of (Jame Research ami Manu^ement 



T. (i. Scott, Ph.D.. Came Specialist and Head 

 Ralph E. Ykatter. Ph.D., Came Specialist 



F. C. Bellkose, B.S., Came Specialist 



H. C. Hanson. M.S., Assistant Came Specialist 

 J. S. JoRD\N. Ph.D., Assistant Came Technician 

 Ross J. Miller, M.S., Field Ecologist 

 Frances D. Robbins, B.A., Technical Assistant 

 Virginia A. Whipple, Technical Assistant 

 John M. Schilling. Field Assistant 

 William B. Robertson. Jr., Ph.D., Research 



Assistant* 

 James Opsahl. M.S., Field Assistant* 



Section of Publications and Public Relations 



James S. Ayars, B.S., Technical Editor and Head 

 Blanche P. Young, B.A., Assistant Technical 



Editor 

 William E. Clark, Assistant Techniial Photog- 



raper 

 Milan Dobrovic. B..\., Technical Assistant 



Technical Library 



Ruth R. Warrick. B.S., B.S.L.S., Technical 



Librarian 

 Olga E. Griminger, M.S., Assistant Techniial 



Librarian 



Consultants: Herpetology. Hobart M. Smith, Ph.D., Associate Professor of Zoology, University of HUnois; 

 Parasitology, Norman D. Levine, Ph.D.. Professor of Veterinary Parasitology and of Veterinary Re- 

 search. University of HUnois. 



♦Employed on co-operative projects with one of several agencies: Illinois Agricultural Extension Service, 

 Illinois Department of Conservation, United States Army Surgeon General's Office, United States Depart- 

 ment of Agriculture, United States FJsh and W'ildlife Service, United States Public Health Service, and others. 



This paper is a contribution from I lio Sfclion of Applied Botany artel Plant I'atlntlogy 



(160G2— 4M— 5-.^5) q^^^e>2 



