22 THE BLACK HILLS BEETLE. 



(10) The result of experiments and observations indicate that the 

 trap-tree method can not be successfully adopted for this insect. 



(11) If a large amount of pine timber is blown down at any time, 

 but especially in June and July, it should be carefully watched during 

 the first year or two to determine whether or not it is attacked by the 

 Black Hills beetle, and, if so, the bark should be removed during the 

 fall after the attack is made. 



NOTE. 



The statements in this bulletin under the headings of "Life His- 

 tory," "Natural and Artificial Influences," and "Methods of Con- 

 trol" relate to the Black Hills beetle alone and are not applicable to 

 any other species of barkbeetle. 



