THE AUTHORS 



ROBERT W. CARLSON was employed as biological aid at the time this 

 research project was active. Since then he has completed work for 

 the M.S. degree at the University of Michigan. 



WALTER E. COLE, research entomologist at Intermountain Forest 

 and Range Experiment Station, has been studying the dynamics of 

 forest insect populations since 1960. For 10 years before that he 

 had studied biological evaluations and control of forest insects. He 

 has published several articles and reports about sampling forest 

 insect populations . 



