36 First Report on Economic Zoology. 



The mixtm-e used was made as follows : — 



1 lb. hard soap. 



1 qt. soap dissolved in 



1 sfil- of boilincr water, and 



1 pt. of crude carbolic mixed with the above. 

 Poiu" round the roots of each plant. 



SUB-GEOUr B. ANIMALS WHICH CAUSE IXJUEY AND 

 DISEASE TO MAX'S VEGETABLE PLAXTATIOXS. 



Sectiox III. 

 Animals Injurious to Foeestry. 



Willow Beetle at Norwich. 



{Sarperda carcliarias, Linn.) 



A beetle received by the Board from a con^espondent at Thorpe, 

 Norwich, proved to be 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 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. 



(Sirex juvencus, Linn, and S. gigas, Linn.) 



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

 Board of Agiiculture 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. 

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

 and pupate in the timber and may be found there during the ^vinter. 



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 pupee will hatch out after the wood has even been creosoted. 



