24 BULLETIN 250, U. S. DEPARTMENT OF AGRICULTURE. 
SassaFRas (Sassafras sassafras [l.] Karst.). 
A few male moths were produced in trays started with first-stage larve on 
this foliage. Feeding was fairly heavy in all stages. This foliage was very 
hard to keep in a fresh state and the trays had to be changed frequently. 
Field observers have recorded feeding in all stages and in some instances 
defoliation. 
SERVICE-BERRY (Amelanchier canadensis [L.] Medic.). 
This is a very favorable food plant as the tray experiments and the observa- 
tions in the field show. The trays produced a good percentage of males and 
females. ‘The larve grew rapidly and were of large size. 
Field observers record the feeding of the larve in all stages and in some cases 
a complete defoliation. 
SKUNK CABBAGE (Spathyema fetida [L.] Raf.). 
Mr. Kennedy found fourth and fifth stage larve feeding upon this species, 
and they continued into the sixth stage. Many of the leaves were badly eaten. 
BiacKk Spruce (Picea mariana [Mill.] B.S.P.). 
No field observations were made on this species. - 
In the trays, first-stage larve were reared to adults on this foliage. During 
the first stage, growth was very slow and many died of starvation, but in the 
second stage feeding increased and continued to increase with each successive 
stage. The larve in the last stages were large and fed ravenously. 
NoBWAY SPRUCE (Picea abies [L.] Karst.). 
From trays started with third-stage larvee, adult moths were reared. Larve 
in all the lower stages died before reaching the next stage. In the later stages 
teeding was rapid, but in the first three stages the larve fed very little and 
growth was very slow. 
RED SPRUCE (Picea rubens Sargent). 
Trays started with first-stage larve on this foliage did not produce second- 
stage larve; when started with second-stage, male moths were produced only. 
In the first stage no feeding could be found on the foliage, and in the next 
stages feeding and growth were slow. In the last ‘stages, however, the larve 
fed ravenously and growth was much faster. 
Wuitt Spruce (Picea canadensis (Mill.) B.S.P.). 
The second stage preduced a small percentage of male moths, and no females 
with larve started in trays on this foliage. Those started in the first stage 
died before reaching the second stage. In the later stages feeding was fairly 
heavy and growth was rapid. It is about the same in favorability as red 
spruce, 
MouUNTAIN SuMac (Rhus copallina L.. 
This is one of the most favorable foods for all stages of the 1arve, A good 
percentage of males and females were reared from first-stage larve in the trays 
and growth was rapid. 
All stages have been observed feeding upon it in the field, and defoliation has 
been noted repeatedly. 
