350 NIPONIUS CANALICOLLIS, 
time in the beetle stage of its existence, or what is, I think, 
perhaps more probable, passes through a number of gener- 
ations in the year corresponding to those of its hosts. I have 
invariably found beetles present in the tunnels of various bark- 
boring and wood-boring Scolyttdz from the beginning of May 
up to the middle of July. 
Points tn the life-history requiring further observation. 
1. Where the eggs are laid, Is it in the tunnels of the 
Rhyncholus and Hylastes beetles ? 
2. What the larvee feed upon and length of time passed 
in this stage and in the pupal stage. 
3. The length of time spent in the beetle stage. 
4. The number of generations in the year. 
5. Where and in which stage the winter is passed 
through. 
