PINE BEETLE. 
61 
upon myself the responsibility of advising its application in a dry 
powder, which has risk for the operator ; or to food crops, although 
careful analysis appears to show the small quantity of arsenic applied 
is much below what can do harm in the ground; hut stirred into water 
for such purposes as sprinkling in Pine nurseries, or for application to 
leafage of infested trees generally, &c., it might be very useful. 
Pine Beetle. Hylurgus Piniperda, Curtis. 
Hylurgus Piniperda. 
1 and 2, Pine shoots pierced by Beetles in section ; 3, 4, Pine Beetle, nat. size and 
mag.; ee, jaws, with chin and feelers between, much magnified. 
Mr. Robert Coupar, Colenden, Scone, together with observations 
in confirmation of the notes of habits and methods of prevention of 
the Pine Beetle, which have been previously given by himself and 
other observers in these Reports, contributed the following notes on 
prevention :— 
“ When young plantations of about six to twelve years old are 
attacked they may be gone over, say in June or July, and the infested 
shoots picked off; but (as these Beetles are very wary) at a touch to 
the branch they back out of their tunnels and fall to the ground. 
Therefore, after collecting attacked shoots into a basket, the work may 
prove to have been to no purpose, and on arrival at the end of your 
journey you may find the shoots quite clear of Beetles, these having 
all escaped. The most serviceable (and a quite practicable) way is to 
set a quantity of ‘Beetle-traps,’ which are laid about in the plantation^ 
and are thus arranged :—Cut in the autumn a quantity of young Scots 
Pine tops (thinning off all the branches, which makes them more con¬ 
venient to handle). Lay these props about in the young plantations, 
or up against the lower part of the standing trees, so that the under 
side will not rest on the ground , because the Beetles do not lay their 
eggs where the trees are lying amongst damp or wet. 
