42 INJURIOUS INSECTS OF 1909 AND IQIO. 
This would seem to show that, if the dozer had been so con- 
structed that the hoppers could not escape from its anterior end, 
this treatment would have been very effective. At this time, Sep- 
tember 22d, a new hopperdozer is being built and developed from 
our experience with the one which we used at Albert Lea, and from 
points gained by talking with practical nurserymen. This should 
be of service another season. 
Suggestions for Further Work. 
It does not appear that the feeding habits of this hopper have 
been discussed heretofore. In the next report the manner of their 
feeding on the under sides of the leaves, taking their nourishment 
from the under sides of the leaves, and leaving the upper surfaces 
with more nourishment, thereby causing them to grow more rapidly 
than the under sides, and thus curling the leaves downward, and the 
habit they have of always hiding on the under sides of any object 
on which they are placed, should all be discussed fully. 
I have not seen a careful description of the different nymphal 
stages, though these have been figured if they have not been 
described. A careful and distinguishing description of each stage 
would be very desirable. A key to stages was made last summer. 
The egg-laying capacity of each female should be worked out, 
if possible, and the proportion of the sexes at different seasons of 
the year be determined. 
It would be desirable to give a brief discussion of this common 
pest, and a statement of how it may be found and recognized by 
farmers and others interested. Its predaceous enemies should be 
studied. If it has parasitic enemies, they are evidently very scarce, 
as we have discovered none in our numerous experiments of three 
seasons. 
Consideration should be given to the possibility of spraying 
with either Bordeaux mixture alone, or Bordeaux mixture and 
resin, or fish oil soap, when the trees are in a dormant condition, or 
at least before time of hatching of the winter eggs, in order to 
cover the egg-blisters with a covering which might prevent the 
hatching of the hoppers. 
