of the lower branches. These were the dead bodies and empty wax 

 cups of insects of the two or three preceding- years. No living young 

 were found here, although male cocoons were abundant. These remains 

 were to be counted by the thousands and the cracked and displaced 

 bark was sufficient evidence of the cause of the death of the branches. 

 As the examination proceeded upward, the same condition was exhib- 

 ited by the higher branches. The number of insects seemingly 

 increased towards the middle of the tree, where living young were seen 

 in countless numbers. Nearer tr.etop of the tree the insects seemed to 

 be but a year old. Here the male cocoons were much fewer than on 

 the intermediate and lower branches. The uppermost leaf-bearing 

 branches showed comparatively few insects which were confined to the 

 bases, the upper parts being free from insects and apparently in a 

 healthy condition. In all cases the old insects were confined to the 

 under side of the more horizontal branches and seemingly to the shaded 

 sides of those more nearly vertical. Very few old remaiiis were found 

 on the trunk, and these only in the deeper recesses of the bark. 



An'examination of other trees on the grounds showed them to be 

 very generally affected, though few so badly as the first tree examined. 

 The smooth-bark trees exhibited the greater number of insects. This 

 is probably due to the protection afiorded the cork elm by the plates of 

 cork which cover a large part of the living bark on the branches and 

 twigs of this elm. One young tree, twelve feet or more high, standing 

 beside the east walk, showed a scattering few mature females, which 

 were noticed only on careful examination, but thousands of young were 

 lound clustered in various protecting cracks and depressions in the bark. 

 This tree had evidently been attacked for the first time the present 

 year, and, although the mature insects were comparatively few, yet they 

 were able to thoroughly stock the tree. As the bark at this time was 

 very thin and tender, a large proportion of the young insects would 

 be likely to survive and produce a host of matured insects the coming 

 year. 



A tree in the street, two blocks from the Capitol, was badly infested. 

 The insects all appeared comparatively young, however, and the tree 

 was in full leaf. Many young lice were found on the under surface of 

 the leaves, especially at the axils of the veins. Presumably, these were 

 stragglers which would not return to the branches for hibernation. 



As was expected, no other kinds of trees were found affected, 

 although maples and box-elders stand among the elms in different 

 parts of the grounds. 



APPEARANCE OF THE INSECT DESCRIBED. 



One is most apt to first notice the presence of this insect by seeing 



