1917 



ENTOMOLOGICAL SOCIETY 



73 



AN HISTORICAL ACCOUNT OF THE FOREST TENT CATERPILLAR 

 AND OF THE FALL AVEBWOR^E IN NORTH AMERICA. 



A. B. Baikd, Do:i[iN-ioN Extomological Laboratouy, Fkederictox, N.B. 



Introduction. 



Since 1911, the Entomological Branch of the Dominion Department of Agri- 

 culture has been conducting a study of the natural control of two common insects 

 that from time to time are very injurious to forest, orchard, and shade trees 

 throuirhout the Dominion. The work is being carried on from the Fredericton 



Map of North America, showing the three regions referred to in the text. 



