STATE OF ILLINOIS 
WILLIAM G. STRATTON, Governor 
DEPARTMENT OF REGISTRATION AND EDUCATION 
VerA M. Binks, Director 
BOARD OF NATURAL RESOURCES AND CONSERVATION 
VerA M. Brinks, Chairman 
. E. Emerson, Ph.D., Biology 
. H. Tirrany, Ph.D., Forestry 
WALTER H. NeEwuouseE, Ph.D., Geology 
RoGer Apams, Ph.D., D.Sc., Chemistry 
Rosert H. ANDERSON, B.S.C.E., Engineering 
Lioyp Morey, B.A., B.Mus., C.P.A., LL.D., D.Sc., President of the University of Illinois 
DetyteE 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 
GeorGE C. DeEcKER, Ph.D., Entomologist and 
Head 
. H. Biccer, M.S., Entomologist 
. L. ENGuiisH, Ph.D., Entomologist 
S. C. CHANDLER, B.S., Associate Entomologist 
Wiuis N. Bruce, Ph.D., Associate Entomologist 
NorMan C. GANNON, Ph.D., Associate Ento- 
mologist 
Joun M. Wricut, Ph.D., Associate Entomologist 
Paut SurANYI, Ph.D., Associate Entomologist 
W. H. Luckmann, M.S., Associate Entomologist 
Rona.tp H. MEYER, B.S., Assistant Entomologist 
Joun W. Matteson, B.A., Field Assistant 
ROBERT SNETSINGER, M.S., Field Assistant 
SuE E. Watkins, Technical Assistant 
H. B. Petty, Ph.D., Extension Specialist in En- 
tomology* 
STEVENSON Moore, III, Ph.D., Extension 
Specialist in Entomology* 
Joun ArtHuR Lowe, B.S., Research Assistant* 
Mouwan Rao, M.S., Research Assistant* 
CLARENCE E. Wuite, B.S., Research Assistant* 
Louise ZINGRONE, B.S., Research Assistant* 
Section of Faunistic Surveys and Insect 
Identification 
H. H. Ross, Ph.D., Systematic Entomologist and 
Head 
Mitton W. SANDERSON, Ph.D., Taxonomist 
Lewis J. STANNARD, JR., Ph.D., Associate Tax- 
onomist 
Puiie W. Situ, Ph.D., Associate Taxonomist 
Leonora K. Gioyp, M.S., Assistant Taxonomist 
Tuomas E. Moore, M.S., Technical Assistant 
BARBARA GutTowsky, M.A., Technical Assistant 
Section of Aquatic Biology 
GEorGE W. BENNETT, Ph.D., Aquatic Biologist 
and Head 
WILiiAM C. STARRETT, Ph.D., Aquatic Biologist 
R. W. Larimore, Ph.D., Associate Aquatic Bi- 
ologist 
DonaLp F. HANSEN, Ph.D., Assistant Aquatic 
Biologist 
Ropert D. Crompton, Field Assistant 
LEONARD DurRHAM, M.S., Research Assistant* 
WILLIAM F. CuILp_ers, B.S., Technical Assistant* 
Section of Applied Botany and Plant 
Pathology 
J. Cone CarTER, Ph.D., Plant Pathologist and 
ea 
J. L. Forsserc, Ph.D., Plant Pathologist 
G. H. Borewe, M.S., Associate Botanist 
R. J. CAMpANA, Ph.D., Assistant Plant Pathol- 
ogist 
I. R. SCHNEIDER, Ph.D., Assistant Plant Pa- 
thologist 
E. B. Hime ick, M.S., Assistant Plant Pathologist 
Ropert A. Evers, Ph.D., Assistant Botanist 
RovenriA F. Fitz-Geratp, B.A., Technical 
Assistant 
James D. Bivsruck, M.S., Reasearch Assistant* 
Section of Game Research and Management 
T. G. Scott, Ph.D., Game Specialist and Head 
RALPH E. YEATTER, Ph.D., Game Specialist 
F. C. BELLROSE, B.S., Game Specialist 
H. C. Hanson, M.S:, Assistant Game Specialist 
J. S. JorDAN, Ph.D., Assistant Game Technician 
Ross J. MILter, M.S., Field Ecologist 
FRANCES D. Rossins, 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 
WiuiaM E., Crark, Assistant Technical Photog- 
rapher 
MrivLan Dopsrovic, B.A., Technical Assistant 
Technical Library 
RutH R. Warrick, B.S., B.S.L.S., Technical 
Librarian 
Oxtca E. Grimincer, B.A., Assistant Technical 
Librarian 
CoNnSULTANTS: HerpEToLoGy, Hopart M. Smitu, Ph.D., Associate Professor of Zoology, University of Illinois; 
PARASITOLOGY, NORMAN D. LEVINE, Ph.D., Professor of Velerinary Parasitology and of Veterinary Re- 
search, University of Illinois. 
_ *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 Fish and Wildlife Service, United States Public Health Service, and others. 
This paper is a contribution from the Section of Aquatic Biology. 
(13822—3500—3-55) 
