STATE OF ILLINOIS 

 DwiGHT H. Green, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 

 Frank G. Thompson, Director 



BOARD OF NATURAL RESOURCES AND CONSERVATION 

 Frank G. Thompson, Chairman 

 William Trelease, D.Sc, LL.D., Biology* Arthur Cutts Willard, D.Eng., LL.D., 



Ezra J. Kraus, Ph.D., D.Sc, Forestry President of the University of Illinois 



L. R. HowsoN, B.S.C.E., C.E., Engineering Norman L. Bowen, Ph.D., Geology 



Roger Adams, Ph.D., D.Sc, Chemistry 



NATURAL HISTORY SURVEY DIVISION 



Urbana, Illinois 



Scientific and Technical Staff 



Theodore H. Prison, Ph.D., Chief 



Florence A. Nyberg, Assistant to the Chief 



Section of Economic Entomology 



G. C. Decker, Ph.D., Entomolgist 

 M. D. Farrar, Ph.D., Research Entomolo- 

 gist 

 J. H. Bigger, M.S., Associate Entomologist 

 S. C. Chandler, B.S., Southern Field Ento- 

 mologist 

 James W. Apple, M.S., Northern Field 

 Entomologist 



B. G. Berger, M.A., Assistant Entomologist 

 John M. Wright, B.A., Assistant Ento- 

 mologist (on leave) 



H. B. Petty, Jr., M.A., Associate in Ento- 

 mology Extension 



C. J. Weinman, Ph.D., Special Research 

 Assistant 



Willis N. Bruce, B.S., Special Research 

 Assistant 



Section of Insect Survey 



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



Carl O. Mohr, Ph.D., Associate Entomolo- 

 gist, Artist (on leave) 



B. D. Burks, Ph.D., Assistant Entomolo- 

 gist (on leave) 



Milton W. Sanderson, Ph.D., Assistant 

 Entomologist 



Kathryn M. Sommerman, M.S., Artist, 

 Entomological Assistant 



Phyllis A. Beaver, Laboratory Assistant 



Section of Forestry 

 James E. Davis, M.F., Extension Forester 



Section of Aquatic Biology 



George W. Bennett, Ph.D., Limnologist 

 D. F. Hansen, Ph.D., Assistant Zoologist 

 Paul G. Barnickol, M.A., Ichthyologist 

 Bruno von Limbach, M.S., Special Re- 

 search Assistant 



Section of Game Research and Management 

 R. E. Yeatter, Ph.D., Game Specialist 



Section of Wildlife Experimental Areas 



Arthur S. Hawkins, M.S., Game Tech- 

 nician (on leave) 



F. C. Bellrose, Jr., B.S., Assistant Game 

 Technician 



Harold C. Hanson, M.S., Assistant Game 

 Technician 



Section of Applied Botany and Plant 

 Pathology 

 L. R. Tehon, Ph.D., Botanist 

 J. C. Carter, Ph.D., Assistant Botanist 



G. H. BoEWE, M.S., Field Botanist 



J. L. Forsberg, M.S., Research Pathologist 

 Bessie B. Henderson, M.S., Research Assist- 

 ant 



Section of Publications 



James S. Avars, B.S., Technical Editor 

 Eleanor G. Wolff, B.Ed., Assistant Tech- 

 nical Editor 



Technical Library 



Marguerite Simmons, M.A., M.S., Techni- 

 cal Librarian 



Consultants in Herpetology: Howard K. Gloyd, Ph.D., Director of the Museum, Chicago 

 Academy of Sciences ; Clifford H. Pope, B.S., Curator of Amphibians and Reptiles, Chicago 

 Natural History Museum 

 ♦Deceased January 1, 1945. 



Thit paper ia a. contribution from the Section of Applied Botany and Plant Pathology. 



(81409— 2M— 4-45) 



