BULLETIN 900, U. S. DEPARTMENT OF AGRICULTURE. 
ECLOSION OF MOTHS. 
Transformation of pupae to adults occurred during the period from 
July 19 to August 8, the majority of them having appeared by 
August 3. The dates of eclosion are shown in Table I. 
HIBERNATION IN THE EGG STAGE. 
By miscellaneous rearings in the season of 1915, the writer had 
learned that moths of this species appeared in midsummer, and ac- 
cording to most of the available information the insect was two- 
brooded. Consequently the eggs secured in cages were expected to 
produce a second generation in 1916. There proved to be only one 
generation, however. When the eggshells appeared to give way and 
the eggs became depressed (see description of egg), it was feared that 
they were infertile and a persistent search for second-brood larvae in 
vineyards where the first brood had been abundant was begun. Not 
a single larva was found, nor did a single egg hatch that season, al- 
though it was shown by hatching records the following season that 
practically all of the eggs were fertile. 
STUDIES AT NORTH EAST, PA., IN 1917. 
The time of hatching of larvae in 1917 and the time of occurrence and 
duration of the larval, pupal, and adult stages are given in Table II. 
Table II. — Dates of hatching and of occurrence and duration of stages of the grapevine 
looper, North East, Pa., 1917. 
Number of in- 
dividuals. 
Date of 
Date of 
Dura- 
tion of 
Date of 
Dura- 
tion of 
Date of 
Dura- 
tion of 
Total 
duration 
hatch- 
ing. 
spinning 
cocoon. 
feeding 
period. 
pupa- 
tion. 
prepupal 
period. 
eclosion. 
pupal 
period. 
of im- 
mature 
stages. 
Days. 
Days. 
Days. 
Days. 
June 2 
July 17 
45 
July 19 
2 
July 29 
10 
58 
2 
21 
49 
23 
2 
Aug. 2 
10 
61 
2 
21 
25 
49 
53 
2 
July 27 
2 
Aug. 5 
9 
64 
3 
17 
44 
19 
2 
July 29 
10 
56 
3 
19 
46 
21 
2 
30 
9 
57 
3 
20 
47 
22 
2 
31 
9 
58 
3 
21 
48 
23 
2 
Aug. 2 
10 
60 
3 
22 
49 
24 
2 
3 
10 
61 
3 
24 
51 
26 
2 
5 
10 
63 
3 
25 
52 
27 
2 
6 
10 
64 
4 
18 
44 
21 
3 
July 30 
9 
56 
4 
19 
45 
21 
2 
30 
9 
56 
4 
21 
47 
23 
2 
Aug. 2 
10 
59 
4 
22 
48 
24 
2 
4 
11 
61 
4 
24 
50 
26 
2 
5 
10 
62 
5 
17 
42 
20 
3 
July 31 
11 
56 
5 
19 
44 
21 
2 
31 
10 
56 
5 
20 
45 
21 
1 
30 
9 
55 
5 
20 
45 
23 
3 
Aug. 1 
9 
57 
5 
21 
46 
23 
2 
2 
10 
58 
5 
23 
48 
24 
1 
2 
9 
58 
= 
23 
24 
48 
49 
5 
July 26 
2 
Aug. 5 
10 
61 
5 
25 
50 
6 
17 
41 
July i9 
2 
July 29 
10 
53 
6 
19 
43 
21 
2 
31 
10 
55 
6 
21 
45 
23 
2 
Aug. 1 
9 
56 
7 
20 
43 
22 
2 
1 
10 
55 
7 
21 
44 
23 
2 
2 
10 
56 
7 
22 
45 
24 
2 
4 
11 
58 
7 
23 
46 
24 
1 
1 
8 
55 
7 
23 
46 
24 
1 
2 
9 
56 
7 
24 
47 
26 
2 
Aug. 5 
10 
59 
8 
24 
46 
26 
2 
6 
11 
59 
8 
27 
49 
29 
2 
