BUPRESTID-BEETLES. 



61 



and the shoots which come up in July can not be infested. (Of 

 course in our state we should wait at least fourteen days longer 

 with this operation). The best results will be obtained by com- 

 bining both methods. Cutting the new shoots causes the death 

 of the young larvae, which are imable to subsist on dead wood, 

 and being footless, they are unable to migrate to new stalks." 



Another species of Agrilus {A. sinuatns), imported from 

 Europe within recent years, is very destructive in the eastern 

 United States : its larva feeds between the bark and wood of 

 pear-trees, making immensely long zig-zag galleries, and in this 

 manner girdling and killing the tree. It differs in one remark- 

 able respect from om^ destructive species in that it remains two 

 years in the larval state. Although not found in Minnesota, the 

 peculiar work of this injurious insect is illustrated (Fig. 67), so 

 that it mav be recosfnized in case our orchards should ever abound 



Fig. 68. — Agrilus bilincatiis, Web. After Division of Entomology, U. S. Depart- 

 ment of Agriculture. 



in such luscious fruit as pears. Fig. 68 illustrates still another 

 species {A. bilineatiis Webb-), which is not rarely found in Min- 

 nesota. 



After describing such destructive beetles as those mentioned 

 above, it is a pleasure to be able to say a good word for the 

 insects that form the next families. 



