36 First Report on Economic Zoology . 
The mixture used was made as follows : — 
1 lb. hard soap. 
1 qt. soap dissolved in 
1 gal. of boiling water, and 
1 pt. of crude carbolic mixed with the above. 
Pour round the roots of each plant. 
SUB-GROUP B. ANIMALS WHICH CAUSE INJURY AND 
DISEASE TO MAN’S VEGETABLE PLANTATIONS. 
Section III. 
Animals Injurious to Forestry. 
Willow Beetle at Norwich. 
(. Savper da carcharicis, Linn.) 
A beetle received by the Board from a correspondent at Thorpe, 
Norwich, proved to be one of the longicorn beetles — the largest 
British species — Sctrperda carchctrias, Linn. It is found chiefly in 
the Fen districts, and was at one time very common there, but 
appears to be now more local. It is found in and about old willows. 
The larvae burrow into the wood of willow, aspen, and poplar; they 
do considerable damage to a tree, but are seldom sufficiently abundant 
to call for any remedial measures. 
Sirex Flies in Fir Trees. 
(Sir ex juvencus, Linn, and S. gigccs, Linn.) 
Fir trees in the neighbourhood of Bath have been reported to the 
Board of Agriculture as being seriously attacked by the two common 
British Wood Wasps ( Sirex juvencus and Sirex gigas), the former 
popularly called the Steel Blue Sirex, the latter the Giant Sirex. 
T1 ie larva} of these two insects, which burrow into the wood, remain 
and pupate in the timber and may be found there during the winter. 
Infested trees should be cut down and burnt. They should not 
be cut up into post and rails, as is often done, as many of the larvae 
and pupae will hatch out after the wood has even been creosoted. 
