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Moreover, many of the insects we are to study are insidious in their 

 method of attack, and ere their presence is noticed, they are so far 

 established that their removal is difficult. It is a fact that our elms 

 are in danger ; some have already died, some are sickly from the 

 attacks of insects, some less severely affected are yet infested, and 

 on the way to ruin, so that it is none too soon to give attention to 

 them. General remedies have been considered in the first part of 

 this paper, and most of these are applicable to the elm, but it will 

 be better to speak of specific remedies in connection with specific 

 insects. In Europe over a hundred different species of insects 

 have been described by entomologists which infest the European 

 elm. A less number have thus far been found on the American 

 elm, but in the list which is given on a following page, there will 

 be found a sufficiently powerful array of foes to satisfy the most 

 belligerent. In considering the damage which anv insect commits, 

 we must have regard to both the time and method of attack. If 

 an insect like the canker worm eats the leaves of a tree, the 

 injury is greater if done in the early part of the season, as it always 

 is, than it would if done later, so, too, since the living, growing 

 parts of a tree are the new roots, twigs and leaves connected by 

 the outer layer of wood and inner layer of bark, an insect which 

 attacks these is more injurious than one which shouUl attack the 

 heart-wood, and so on. 



The following list embraces all the different species of insects 

 which, so far as I have knowledge, attack the elm. I am well 

 aware that such a list is not very interesting in itself, but I hope 

 that it may prove of value to some of those who may read this 

 paper. With the scientific name the common name is given so 

 far as possible. Many of the species have no other name than the 

 scientific. In order to aid those unfamiliar with entomology in 

 the use of the list, I have added after the name of each of the large 

 groups under which the different species are enumerated, a few of 

 the more familiar examples in order that some idea of the char- 

 acter of the group may be gained. For convenience I have 

 arranged the names alphabetically. 



