ACKNOWLEDGEMENTS. 



Tlie writer acknowledges liis many oliligations to all who iiave iielped him in 

 the studies, the results of which are assembled here: especially to the cran- 

 berry growers who everywhere for many years liave given him the freedom 

 of their bog properties and every encouragement; to his coworkers of the 

 Massachusetts Agricultural Experiment Station and the United States De- 

 partment of Agriculture for naming specimens and for cooperation in the 

 study of special problems; to H. B. Scammell for valuable information about 

 the habits and life histories of some of the pests; and to his assistant, J. L. 

 Kelley for his constant faithfulness and efficiency. 



Thanks are due the Cape Cod Cranl)erry Growers' Association for the col- 

 ored plates donated for this bulletin and for other services rendered. 



