48 SCOLYTUS SP. 
having been posted to give notice of fresh trees attacked. 
Mr. Minniken. reported towards the end of 1900 that no new 
trees been had infested after the completion of the preventive 
measures undertaken. 
In rgox the writer made a close inspection of portions of these 
areas, stag-headed and diseased trees being felled here and there 
and carefully examined. The watchers of the previous year, who 
were thoroughly well acquainted with the beetle’s method of 
attack, also aided this search, but no beetles, pupz, or larve 
were to be found in the trees inspected. This inspection was 
made at the end of June. It is too early yet, without further 
study of the habits of the insect, to say definitely that the pre- 
ventive measures instituted nipped in the bud what might have 
proved a serious attack of this pest, but I am of opinion that 
had not the areas been so dealt with, there is every probability 
that the beetles would have multiplied and spread in all directions 
from the two infested centres. 
Points tn the life history requiring further observation. 
1. The number of generations in the year. It is pro- 
bable that this will vary at different elevations. Is 
there a spring generation at the higher elevations ? 
2. The length of time spent in the various stages of 
larva, pupa, and beetle. 
3. In which stage is the winter passed ? 
4. What insects prey upon these beetles and their 
larve in their burrows ? 
