STATE AGRICULTURAL SOCIETY. 
G93 
that they reside upon these trees, and pertain to groups that are 
injurious to vegetation, all the details of their particular habits 
and economy remaining to be investigated. And a multitude 
of small insects, species of moths, midges, etc., which, from their 
occurrence upon these trees in Europe, there can be little doubt 
exist here also, remain yet to be discovered. Were one or two 
seasons specially devoted to ascertaining the insects which 
depredate upon the pine, the number of species which we are 
at present able to present would be greatly augmented. And 
to attain a knowledge of the particular habits of each one of 
these depredators, and the diversified structure of the galleries 
which very many of them mine beneath the bark and in the 
wood, will require the assiduous observations of many years. 
The pines, spruces, firs and cedars are so closely related to 
each other that we should expect a portion of the insects which 
live upon one of these trees would be able to subsist upon some 
or all of the others also. But as the evergreens differ so widely 
from all our other forest trees, and as their terebinthine sap is 
so repulsive to insects generally, it would be deemed quite 
improbable that any insect which lives upon these trees will be 
able to sustain itself upon trees which do not pertain to this 
group. It is a remarkable fact, therefore, that among the insects 
noticed in the following pages, instances occur of species which 
are not confined to this class of trees, but feed and thrive equally 
well upon particular trees of the deciduous class also. A 
notable example of this we have in the large caterpillar of the 
Pine emperor moth, (Ceratocampa imperialist) which inhabits the 
sycamore as well as the pine, than which two trees can scarcely 
be found whose characters and properties throughout appear 
more dissimilar. 
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