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unable to fly very far or high, deposits her eggs in the first suitable 
place that offers. I bave but little doubt tbat the larva, when getting 
too large for the brancb in which it is feeding, migrates to a larger 
branch, as affording sufficient room for its development, for in my insect 
room, where the specimens are kept for breeding, they often do migrate 
from a small branch and eat their way into a larger one, and they have 
even eaten into the yellow pine flooring and covered themselves with 
their trass; one migrated nearly 30 feet and went into the white }>ine 
window-casing, where it remained until it pupated, and emerged as a 
moth. Experience has shown in a great many cases that they are 
amply able to take care of themselves, and when in their burrow and 
drawn up the thoracic and anal shields form perfect opercula imper- 
vious to all external enemies. 
The family of Zeuzerida? are very remarkable from the fact that the 
females have a long and quite hard ovipositor, by means of which they, 
probably, are able to introduce their eggs into the soft tissue between 
the bud and the node on which it is situated so that the young larva 1 
when hatched can without much difficulty enter the twig to feed upon its 
interior. In Europe it is recorded as feeding upon six species of trees, 
and an English writer has made the statement that fruit trees pierced 
by this insect bear even more abundantly than do those untouched by 
it. However this may be, most of the limbs affected break off' entirely 
with us, provided the larva attains its full growth, for it then, in many 
cases girdles the limb, when a storm is most sure to break it off. After 
every storm great quantities of limbs can be seen either entirely broken 
off or still hanging on the trees. In 1893 we spent two months in fight- 
ing this insect alone in our city parks, collecting wagon loads of limbs 
and branches, and destroying the larvae or pupae, as the case might be. 
This is one of the most difficult insects we have to keep in check, 
for it works in secret and does not disclose its whereabouts until the 
damage is done, disfiguring and destroying many of our most valuable 
shade and ornamental trees, and particularly our beautiful American 
white elm, which, if not killed outright, is thrown out of character by 
severing its leading branches. In many cases the entire head of the 
tree is severed from the trunk, and it may have attained a diameter of 
six or more inches. 
Again we find as many as six larva? in a single tree but three inches 
in diameter, any one of which is able to destroy the tree if not removed. 
These are cut out as soon as detected, and all the young elms 
undergo a rigid examination three or four times a year. A system of 
lights has been projected for use in the Central Park, but as yet the 
means to the end desired has not been given. The light would attract 
many males of this species and some females, but most of the females 
are too heavy to fly far, or at least seem to be unable to when in cap- 
tivity, but the lights would attract other noxious moths which could be 
easily taken in traps. This insect, working in secret, can only be 
