
= SIREX SP. 155 
ee eae ere CE rn eee Pope eer eee 
to be expected from it. As long as timber is cut up and sold 
green it would appear that the pest is not to be feared, since it 
probably does not commence its attacks until the tree is either 
dead or felled. Ringing trees is to be avoided where such 
insects exist in a forest, as it provides them with exactly the 
food they require. Dead trees should, whenever possible, be 
cut out and removed. 
Points in the life history requiring further observation. 
1. How the eggs are laid. Does the ? cut through the 
bark into the wood with her ovipositor and a ugur 
andlay them in the wood? Isthe bark necessary 
to the ¢ or willshe lay her eggs in unbarked 
trees and timber ? 
2, Length of time spent by larva boring in the wood, 
. Length of time spent in the pupal state. 
» Length of life of imago. 
. Is there more than one generation in the year? If 
not, do the adults only issue during June and July, 
or do they issue irregularly between June and 
October? 
or —& GY 
