36 
BULLETIN 911, U. S. DEPARTMENT OF AGRICULTURE. 
on November 5, and at Kelleys Island, Ohio, on November 7, live 
larvae were plentiful in the grapes and no case was found where the 
larvae had been killed by the freeze. In the insectary at Sandusky 
after a minimum temperature of 23° F. had been recorded, larvae con- 
tinued to leave the grapes and spin cocoons. Live larvae persisted 
in the insectary on December 3, 1917, after a minimum temperature 
of 17° F. had been recorded. 
LARVA SPINNING ITS COCOON. 
On July 9, 1916, a first-brood larva was observed making its 
cocoon. When first observed the characteristic flap had been cut 
in the leaf but was not folded. The process observed was the turning 
over and tying down of the flap. The larva began at one end and "by 
rapid movements of its head from the free edge of the flap to its 
place of attachment it gradually drew the flap over, the body of the 
larva resting on the flap, and eventually inclosed in it. The entire 
process observed occupied 35 minutes. 
PARASITISM. 
Considering the large numbers of individuals observed during 
these investigations the total amount of parasitism was very low, 
particularly among first-brood pupae taken for the following emer- 
gence records. 
That some parasitism of first-brood pupae occurred is shown in 
Table XXXVII. 
Total. . . . 
Average . 
Table 
XXXVII. 
— Percentage of parasitism of field collected first-brood grape-berry 
moth pupae from Venice, Ohio. 1917. 
Date of collection. 
Number 
of co- 
coons col- 
lected. 
Number 
of para- 
sites 
emerged. 
Percent- 
age of 
para- 
sitism. 
July 26. 
■ 18 
34 
32 
41 
64 
47 
51 
35 
8 
31 

July 28. 
8 
1 
11 
2 
8 
12 
20.58 
July 30. 
3.12 
Aug. 1. . 
26.82 
Aug. 4. . 
3.12 
Aug. 6. . 
17.02 
Aug. 8. . 
23.53 
Aug. 10. 
12 | 34.28 
Aug. 20. 

Do. 
4 1 12. 90 
361 
16.06 
The parasitism of field-collected pupae is seen to vary from to 26 
per cent with an average of 16 per cent for pupae collected between 
July 26 and August 20. 
In a single instance, September 8, 1916, eggs of the berry moth 
were found which were parasitized to an appreciable extent. A total 
of 760 eggs were collected on 11 clusters, of which 236, or 31 per cent, 
