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No other species of Scolytids infesting the same trees seem to have 
been affected by the cause which it would seem has rendered Dendroc- 
tonus frontalis almost extinct. In fact the great number of trees that 
died last summer and fall were found last spring to be infested by 
immense numbers of bark and timber beetles of different species. These 
have since emerged, and it would seem that the only danger to be 
apprehended from a continuation of a trouble like that we have men- 
tioned would be from the attack of some of the species which have thus 
emerged from the dead trees, for it is evident that unless they find 
favorable conditions in the felled trees, tops, stumps, etc., in lumbering 
regions they must either attack and kill living trees or they must perish. 
One species, the Turpentine Bark-beetle, Dendroctonus terebrans, has 
already made a desperate effort in this direction. Early in May the 
adults emerged from the trees in which they had bred, but failed to 
find dying trees, the bark of which they preferred to infest for the pur- 
pose of depositing their eggs. Then followed a remarkable and inter- 
esting occurrence, probably never before observed in the life habits of 
this and other species of Scolytids. They, with numerous other mem- 
bers of the Seolytid family, including both bark and timber beetles, 
must have started, with one accord, in search of more favorable condi- 
tions for their propagation, for they occurred in different sections of 
the State, at about the same time, in great swarms like migrating 
locusts. Specimens were sent to us accompanied by startling accounts 
of plagues of bugs that invaded mill yards, furniture shops, newly 
painted houses, etc. They were reported as coming like a hailstorm 
against the windows, and in at the open doors like swarms of bees, and 
that the air on all sides was full of them. During my absence from 
Morgantown (whereour station is located) one of these migrating swarms 
of Scolytids invaded the town and occurred at certain houses and at 
furniture factories in such immense numbers that some of the people 
became alarmed. The report was started that Hopkins's German bugs 
had devoured all of the pine bugs and were going to prove like the 
English Sparrow, a universal pest. It was probably well for me that I 
was absent at the time. 
The men were painting a new greenhouse at the station at the time, 
and the number of the beetles attracted to the building evidently by 
the odor of turpentine, were so great that the men were exceedingly 
annoyed in their work. When I returned to the station, several days 
after, I found evidence of their numbers in the handfuls of dead 
beetles that failed to escape from the greenhouse. 
Dendroctonus terebrans occurred in by far the greater numbers in 
these migrating swarms, and when they failed to find dying or injured 
trees they attacked living Pine of all kinds. Black Spruce and Norway 
Spruce, entering the bark at the base of the trees. Some of the trees 
thus attacked in May were examined July 15, and the bark near the 
point of the attack was found to contain parent adults, eggs, and full- 
