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 abo\'e. 

 Pour round the roots of each plant. 



SUB-GROUP B. ANIMALS WHICH CAUSE INJUIiY AND 

 DISEASE TO MAN'S VEGETABLE PLANTATIONS. 



Section III. 

 Animals Injurious to Forestry. 



Willow Beetle at Norwich. 



{Sarperda carcharias, Linn.) 



' A beetle received by the Board from a correspondent at Thorpe, 

 Norwich, proved to l^e one of the longicorn beetles — the largest 

 British species — Sarperda carcharias, 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 larva? 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. 



{SircM juvcnci's, Linn, and S. gigas, Linn.) 



Fir trees in the neighbourhood of Bath have been reported to the 

 Board of Agriculture as being seriously attacked by the tM^o common 

 British Wood Wasps [Sirex juvencus and Sircx gigafi), the former 

 popularly called the Steel Blue Sirex, the latter the Giant Sirex. 

 The larvfe of these two insects, wliich burrow into the wood, remain 

 and pupate in the timber and may be found there during the Avinter. 



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 larviB 

 and puppe will hatch out after the wood has even been creosoted. 



