PREFACE TO BULLETIN. 



It is the purpose of this bulletin to include such miscellaneous 

 technical papers on insects, other than the scolytid beetles, as are 

 either injurious or beneficial and of more or less importance in their 

 relation to American forests. These papers are based largely, if not 

 entirely, on original observations and investigations, supplemented 

 by material in the United States National Museum, and serve as a 

 necessary basis for the nontechnical papers on the same insects. 

 As they are intended to be of service especially to the economic 

 entomologists and to the student of forest entomology, they are, as 

 a rule, presented in a somewhat less formal style than if intended for 

 the svstematist only. 



. A. D. H. 



