THE AUTHORS 



ARTHUR L. ROE is leader of the 

 Forest Ecosystems Work Unit 

 of the Intermountain Station at 

 Ogden, Utah. 



GENE D. AMMAN is Entomologist 

 on the Mensurational Aspects 

 of Population Dynamics of For- 

 est Insects Work Unit of the 

 Intermountain Station at Ogden. 



