Department of Agriculture, 



Ottawa, September 14, 1917. 



To the Honourable 



The Minister of Agriculture, 

 Ottawa, Ont. 



Sir, — I have the honour to submit, for your approval, Entomological 

 Bulletin No. 14, Part II, entitled "Canadian Bark-Beetles; Part II: A Pre- 

 liminary Classification, with an Account of the Habits and Means of Control," 

 which has been written by Mr. J. M. Swaine, Assistant Entomologist in charge 

 of Forest Insect Investigations. 



As I pointed out in Part I of this series, the bark-beetles constitute the 

 chief insect enemies of our coniferous forests. Forest fires are spectacular, 

 and the results are immediately and strikingly noticeable, but competent auth- 

 orities are of the opinion that the annual loss caused by the depredations of 

 these and other forest insects which are widely distributed throughout the 

 country is greater in the aggregate than the loss due to forest fires. 



The methods to be adopted to control the outbreaks of these serious enemies 

 of our forests depend upon a knowledge of the species of bark-beetles concerned. 

 Different species have different habits, and as control measures are based upon 

 their habits it is necessary for the forester to be able to recognize the various 

 species that are to be found affecting our timber and shade trees. The object 

 of this bulletin, which brings together the results of the work of many years, 

 is to place in the hands of foresters, students, and other workers requiring such 

 information, a means whereby they will be able to identify readily the species 

 of bark-beetles causing any injuries that may be found in our Canadian forests. 

 An account of the general habits and of the methods of controlling bark-beetle 

 outbreaks is included, and descriptions are given of a number of new species. 



At the present time the protection and correct utilization of our timber 

 resources is of greater importance than ever from a national and imperial stand- 

 point. When the information contained in this bulletin is available to practical 

 foresters it will be of inestimable practical value, as it will assist them in taking 

 the necessary steps to prevent the continued loss of timber now being destroyed 

 and to protect extensive areas that are threatened by the attacks of bark-beetles, 

 most insidious enemies of the forest. 



I have the honour to be, sir. 



Your obedient servant, 



C. GORDON HEWITT, 



Dominion Entomologist and Consulting Zoologist. 

 36198— U 3 



