16 
BULLETI^^ 901, U. S. DEPARTMENT OF AGRICULTURE. 
Table XVII.— T-ime and duration of immature stages in the ground of Altica woodsi, 
North East, Pa., 1916. 
Date of 
entering 
ground. 
Date of 
emergence • 
Number 
of indi- 
viduals. 
Duration 
of period. 
Date of 
entering 
ground. 
Date of 
emergence. 
Number 
of indi- 
viduals. 
Duration 
of period. 
Days. 
Days. 
July 7 
July 24 
1 
17 
July 21 
Aug. 7 
1 
17 
10 
24 
7 
14 
7 
14 
10 
25 
2 
15 
Aug. 1 
16 
1 
15 
10 
26 
1 
16 
1 
17 
1 
16 
15 
29 
3 
14 
3 
19 
3 
16 
16 
Aug. 5 
3 
20 
6 
21 
3 
15 
17 
July 31 
2 
14 
6 
25 
1 
19 
17 
Aug. 2 
1 
16 
8 
25 
1 
17 
18 
2 
1 
15 
8 
26 
1 
18 
18 
6 
7 
19 
8 
29 
1 
21 
19 
2 
1 
14 
21 
5 
3 
15 
1 53 
2 16. 15 
21 
6 
7 
16 
1 Total. 
2 Weighted average. 
EMERGENCE FROM HIBERNATION, 1917. 
A few beetles emerged from hibernation in the latter part of May, 
but they were not abundant until the early part of June. The first 
specimens were collected May 19 on wild grape, when Concord grape 
shoots were about 8 inches long and the flower buds were showing. 
None were collected on 
Table XVIII. — Incubation period of A. woodsi, North i.- . ^ j^-i 
East, Pa 1917. cultivated grapes until 
Jime 3, when they were 
common. They in- 
creased in numbers 
until about June 9. 
Date of 
Date of 
Number 
Duration 
oviposition. 
hatching. 
of eggs. 
of period. 
Days. 
July 19 
July 2 
16 
13 
19 
8 
14 
20 
3 
6 
13 
20 
4 
17 
14 
21 
5 
2 
14 
21 
6 
2 
15 
22 
6 
12 
14 
23 
7 
8 
14 
171 
2 13.72 
July. 
Oviposition began 
about 18 days after the 
emergence of the earli- 
est adults and continued 
until the latter part of 
The latest recorded date of oviposition was July 26. The 
OVIPOSITION. 
Total. 
2 Weighted average. 
longest recorded period of oviposition for a single female was 41 
days, from June 12 to July 23; this beetle deposited eggs on 17 days 
during that period. The number of eggs deposited by four isolated 
females varied from 37 to 181, with an average of 102.5 eggs each. 
Thu'ty-one eggs is the largest number deposited on a single day. 
INCUBATION. 
The duration of the incubation peri 3d of 71 eggs varied from 13 to 
15 days, with an average o^ 13.72 days, as shown in Table XVIII 
