46 
THE PLUM CURCULIO. 
In Table X is presented the egg-laying record of 18 beetles, as 
obtained by Mr. Hammar, at Douglas, Mich., during 1910. The 
beetles were confined June 7, and the last egg was obtained on July 
24. The period of oviposition is noticeably shorter than in several 
other records presented. 
Table X. — Egg-laying record of 18 plum curculios, Douglas, Mich., 1910. 
No. of individual. 
Eggs laid each week by each beetle. 
June 
7-13. 
June 
14-20. 
June 
21-27. 
June 
28-July 4. 
July 
5-11. 
July 
12-18. 
July 
19-26. 
Total. 
47 
81 
201 
57 
74 
85 
64 
112 
110 
83 
57 
25 
25 
31 
83 
26 
148 
Total . 
32!) 
229 
1,414 
No. of individual. 
Date last 
egg laid. 
Date of 
death of 
beetles. 
Days un- 
der obser- 
vation. 
Days on 
which eggs 
were laid. 
Maximum 
number of 
eggs in one 
day. 
Average 
number of 
eggs per 
day. 
1. 
2. 
3. 
4. 
5. 
6 
7. 
8. 
9. 
Id 
11. 
12 
13 
14 
15 
16 
17 
IS 
June 
July 
June 
July 13 
July 
July 
July 
July 
July 
July 
July 
July 
June 
July 
July 
July 
July 
July 
/July 11 
\Aug. 15 
| July 18 
I /Aug. 22 
j\Sept. 5 
I/July 13 
|\July 30 
July 29 
July 5 
Aug. 
1' 
...do 
July 
6 
July 
3 
July 
31 
July 
IS' 
July 6 
July 13 
fJuly 12 
[July 14 
5.06 
5.91 
4.07 
4.13 
3.03 
3.05 
5 09 
3.79 
5.19 
4.38 
5.00 
2.78 
3.44 
6.92 
2.60 
7.79 
Escaped. 
