40 THE PLUM CURCULIO. 
Table III. — Egg-laying records from 10 plum curculios, College Park, Md., 1902 — Con. 
ZTo. 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 laid 
per day. 
1 
Aug. 1 
June 19 
Aug. 2 
June 20 
May 22 
June 19 
Aug. 2 
July 10 
Mav 28 
Mav 31 1 
Julv 31 
July 26 
8 
38 
9 
37 
8 
58 
15 
19 
79 
74 
70 ' 
32 
15 
15 
3 94 
2 
7 34 
3 
4 
June 18 
Aug. 1 
June 19 
May 26 
May 30 
Julv 28 
July 25 
36 
74 
37 
10 
17 
63 
57 
17 
18 
15 
12 
14 
19 
15 
8 44 
5... 
5.89 
7.30 
6 
7. . 
6.20 
8.35 
8 
9 
6 30 
10 
6. 12 
Escaped. 
In. Illinois, in 1904, Prof. C. S. Crandall 1 made many interesting 
observations on 17 female curculios relative to their feeding and egg- 
laying habits. Some of these are shown in Table IV. 
Table IV. — Egg-laying records from 17 plum curculios on apples, Griggsville, III., 1904. 
No. of individual. 
Eggs 
laid. 
Date of 
first egg. 
Date of 
last egg. 
Date of 
death of 
female. 
Days un- 
der ob- 
servation. 
Days on 
which 
eggs 
were laid. 
Maxi- 
mum 
number 
of eggs 
in 1 day. 
Average 
number 
of eggs 
laid per 
day. 
1 
84 
235 
119 
31 
12 
18 
44 
May 25 
May 26 
...do 
...do.... 
May 30 
May 25 
May 26 
Julv 10 
Sept. 3 
July 8 
July 17 
June 13 
Aug. 5 
June 22 
July 24 
Sept. 15 
July 20 
Sept. 10 
June 16 
Sept, 26 
June 23 
63 
115 
59 
111 
25 
127 
32 
32 
84 
37 
14 
9 
12 
22 
9 
8 
9 
5 
2 
3 
4 
2.64 
2 
2. 80 
3 
3.21 
4 
2.21 
5 
1.33 
6 
1.50 
7 
2.00 
8 
9 
19 
263 
98 
May 25 
May 26 
June 3 
Julv 1 
Aug. 10 
June 25 
Julv 26 
Aug. 30 
June 26 
65 
100 
35 
15 
69 
22 
2 
9 
8 
1.26 
10 
3.81 
11 
4.45 
12 
13 
197 
May 26 
Aug. 30 
Sept. 6 
106 
78 
6 
2.52 
14 
15 
160 
34 
252 
249 
125 
• 14 
Mav 26 
Mav 27 
...do 
May 25 
June 2 
June 10 
Aug. 1 
Aug. 17 
Sept. 9 
Aug. 4 
Julv 17 
July 18 
Aug. 9 
Sept. 1 
Sept. 23 
Aug. 10 
July 23 
Aug. 20 
79 
102 
123 
80 
62 
87 
59 
25 
87 
62 
42 
11 
8 
3 
9 
9 
8 
2.71 
16 
17 
1.37 
2.90 
18 
4.01 
19 
2.98 
20 
1.27 
Total 
1,954 
The beetles were captured May 23 (one pair May 26) in the act of 
mating and separately confined in jelly glasses, and were kept indoors 
on a laboratory table. Fresh apples were supplied at regular inter- 
vals. Observations were continued until death of female, as shown. 
During the last four or five years numerous egg-laying records have 
been obtained by the Bureau of Entomology in different parts of the 
country. These and other life-history studies for the most part have 
been made under out-of-doors conditions, approaching as closely as 
possible those which obtained in orchards at the time. (See PI. XII.) 
i 111. Agr. Exp. Sta., Bui. 98, p. 508. 
