1908.] 



Large Larch Saw-Fly. 



655 



MacDougall's paper. A further means of detection has already 

 been mentioned, namely, the dying off and curling round of the 

 short terminal shoots, which is caused by the injury inflicted 

 by the females in depositing their eggs. 



THE LAKE DISTRICT * 



Showing hhe distribution of Th© Large Larch SawFly (Nemarus enchsoni . ) 

 X Saw|r ly present O Trees-rarher badjy attacked ® Trees very badly attacked 



Natural Enemies. — The most important factors in ^ the 

 natural control of the saw-fly which have so far been discovered 

 are birds, and, as will appear strange, the small Field Vole — 

 Microtus (Arvicola) agrestis. 



