Ze BULLETIN 250, U. S. DEPARTMENT OF AGRICULTURE. 
ScorcH PINE (Pinus sylvestris L.). 
Tray experiments started with first-stage larve on this species failed to 
produce second-stage larve. Those started with second-stage produced sixth- 
stage larve, when many died from disease. The feeding was slow until the new 
growth expanded, after which they fed freely. 
Mr. Proctor has noted practically the same thing in the field. 
GRAY PINE (Pinus banksiana Lamb.). 
First-stage larve started on this foliage in the trays failed to go beyond the 
second stage. Trays started with larve in the third stage produced both male 
and female pup. Feeding was fairly free on the foliage after the first stage. 
No field observations were made on this pine. 
WESTERN WHITE PINE (Pinus monticola Dougl.). 
First-stage larve supplied with this foliage failed to reach the second stage, 
but second-stage larve fed and a good number of male moths were produced. 
The feeding after the first stage was quite free, and this food seems to be more 
favored than the white pine. 
No field observations were made on this pine. 
WHITE PINE (Pinus strobus L.). 
Tray experiments show that first-stage larve can not feed to any extent upon 
the foliage and do not pass into the second stage. Mr. Collins succeeded in 
rearing adults from second-stage larve at Worcester on white pine. 
In the field, where the pine is clear or in mixture with hemlock, feeding did 
not begin before the third or fourth stages. When the pine is mixed with gray 
birch or with any of the oaks, first and second stage larve were observed feed- 
ing to a slight extent. 
The larva begins feeding near the base of the needle and eats through until 
the larger part falls to the ground. Other needles are attacked in the same 
way, so that a tree may be stripped in a very short time. (Pl. VI.) 
BEACH PLUM (Prunus maritima Wang.). 
Beach plum is not a particularly favored food plant. First-stage larve died 
before completing the third stage, and those started in the third stage produced 
male moths only. They fed but little, grew very slowly, and the pup were of 
small size. 
Mr. Kennedy observed larve in the first, second, and third stages feeding 
upon this foliage to a slight extent in the field. 
AMERICAN ASPEN (Populus tremuloides Michx.). 
Although this species can not be placed in the class with oak, apple, willow, 
ete., in favorability, yet it will support the larve from time of hatching to 
pupation, and will produce fairly vigorous pupe. The male moths developed 
from experiments when larve were started in the first stage. 
Feeding was observed in the field by all stages, and in some cases complete 
defoliation resulted. 
