adult stage. 
FOOD PLANTS OF THE GIPSY MOTH IN AMERICA. 29 
GRAY BIRCH AND WHITE PINE. 
The larve fed freely in all stages on gray birch, but none at all on the pine 
in the first stage. The feeding on the latter species gradually increased until, 
in the last stages, they fed as well on this foliage as on the birch. They grew 
well and attained normal size and several reached the adult stage. 
In the field in areas having this combination, the larve fed on the birch 
during the first three stages, when they attacked the pines. These were de- 
foliated in many cases in the last three stages. The prevalence of wilt in the 
field often exerts a powerful influence in preventing complete defoliation of 
pine when it is grown in this combination. 
Gray BircH AND RED SPRUCE. 
During the first stage all of the feeding was on the gray birch. There was 
a slight increase in feeding on the spruce in the later stages until the last two, 
when it diminished on the spruce. | 
The larve were rather small in size and grew slowly. A few reached the 
PAPER BIRCH AND HEMLOCK. 
The larve fed freely on the paper birch in all stages. No feeding was noted 
on hemlock in the first stage, light in the second, and increasing during the 
third, and continuing moderate until the trays were closed. The larve showed 
a preference for birch in all stages, grew steadily to large size, and a large 
number of male and female moths developed. 
PAPER BIRCH AND SUGAR MAPLE. 
The sugar maple in combination with this species is a favorable food. The 
larve fed upon it freely from the first to the fifth stages. During the fifth 
and sixth stages it was eaten more moderately. Birch was eaten freely at all 
times, although preferred in the later stages. Both species were eaten equally 
in the earlier stages. 
The larve were of medium size and several reached the adult stage. 
PAPER BIRCH AND LARGE-TOOTHED ASPEN. 
Both of these foods are favorable. Except in the first stage, when the poplar 
was preferred, the larvee fed with the same degree of freedom upon each. They 
grew steadily in the first stage, but more rapidly in the remaining stages, and 
attained average size. Several developed into adults. 
PAPER BiIRCcH AND RED SPRUCE. 
Larve fed freely on the birch in all stages, but did not feed on the spruce in 
the first stage. Feeding increased from the beginning of the second stage to 
the end of the fifth. Medium-sized larve resulted, from which several adults 
developed. 
PAPER BIRCH AND WITCH-HAZEL. 
The larve fed freely on both food plants, with slight preference for witch- 
hazel until near the end of the experiment, when birch was eaten more freely. 
Large larve resulted, from which several adults developed. 
