SOME TREE-DESTROYING INSECTS. 
5 
For any of these leaf-eaters, while they 
are working, a spray of arsenate of lead, 
at the rate of three pounds of the arsenate 
of lead paste to fifty gallons of water is 
advised. Some accurate knowledge of 
the life history of the species often shows 
a vulnerable point at which the insect can 
be combated with means other than 
spraying. For instance, in the case of the 
fall Aveb worm and the tent caterpillars, 
the fact that at certain periods of the day, 
the caterpillars are sure to be found with- 
in the web can be taken advantage of, and 
during that time, the webs can be cut out 
with their quota of worms and destroyed. 
Fig. 3. Adult poplar beetle, En- 
larged and natural size. 
Fig. 4. Larva of tussock moth and wingless female laying eggs on cocoon. 
The fact that the handmaid moths gather in large masses at certain 
periods may also be taken advantage of. The white-marked tussock 
moth in late summer produces a very conspicuous mass of eggs 
which do not hatch until the next spring. These eggs may be 
easily picked off and destroyed during the dormant season, thus 
preventing the ravages from the forms that would hatch from these 
