52 
THE PLUM CUKCULIO. 
The longest egg period was 11 days 2 hours, the shortest 7 days 18 
hours, the average length of all lots being 9.23 days. These figures 
are in wide contrast to those, obtained at Washington in 1905, and 
indeed at all other localities, except for April, at Barnesville, Ga., 
and the early part of June at Douglas, Mich., in 1910. 
Comprehensive data were obtained by Mr. Hammar during 1910, 
at Douglas, Mich., for June and July, these months averaging some- 
what cooler than normal. A total of 944 eggs was observed under 
out-of-doors conditions, as detailed in Table XVI. 
Table XVI. — Length of egg stage of the plum curculio, Douglas, Mich., 1910. 
Eggs 
under 
obser- 
vation. 
Date 
of 
deposi- 
tion. 
Eggs hatching in specified days from 
deposition. 
Total 
egg 
days. 
4 
5 
6 
7 
8 
9 
10 
11 
12 
11 
8 
40 
22 
52 
46 
54 
28 
27 
36 
11 
50 
31 
33 
18 
14 
92 
36 
38 
33 
37 
June 9 
June 10 
June 11 
June 12 
June 13 
June 14 
June 15 
June 16 
June 17 
June 18 
June 19 
June 21 
June 22 
June 23 
June 24 
June 25 
June 26 
June 27 
June 28 
June 29 
June 30 
To 
July 1 
July 3 
July 4 
July 5 
July 6 
July 7 
July 8 
July 9 
July 10 
July 11 
July 12 
July 14 
July 15 
Julv 17 
July 18 
July 19 
July 21 
July 22 
July 23 
July 26 
July 28 
To 
1 
2 
33 
19 
2 
4 
6 
4 
2 
117 
78 
353 
195 
408 
332 
362 
152 
137 
180 
52 
246 
156 
180 
110 
80 
129 
189 
198 
175 
185 
7 
3 
40 
10 
4 
10 
36 
30 
20 
12 
2 
3' 
12 
6 
10 
1 
"3' 
11 
16 
25 
36 
8 
32 
18 
2 
5 
4 
28 
24 
1 
37 
4 
7 
17 
3 
10 
13 
7 
11 
21 
2 
4 
9 
.... 
2 
647 
al 
4,014 
13 
22 
12 
21 
10 
18 
16 
30 
40 
10 
18 
16 
14 
3 
6 
8 
8 
8 
10 
5 
9 
297 
19 
12 
14 
10 
2 
4 
25 
20 
io' 
15 
6 
84 
129 
123 
60 
78 
84 
175 
220 
60 
92 
95 
83 
18 
42 
40 
25 
25 
61 
39 
63 
3 
Li 
"~8" 
"6" 
5 
"2 
12 
5 
20 
5 
.... 
2 
5 
5 
3 
3 
6 
8 
5 
5 
5 
I 6 
3 
9 
1 
1 
| 
tql 
1,668 
Average length of egg stage for June 
Average length of egg stage for July 
Average length of egg stage for June and July. 
.days.. 6.20 
.do.... 5.61 
.do.... 6.02 
