LIFE HISTORY AND HABITS: TIIK EGG. 
51 
The shortest period, 2 days 18.5 hours, April 9 to 12, was closely 
approximated later in the season, June 7. The longest period, 6 
days 21.5 hours, occurred April 15 to 22. The average egg period 
for the entire series is 4.44 days. 
In Table XIV are given records of 113 eggs, observed in 1907 at 
Xew Kichmond, Ohio, on different dates during May and June. 
The longest egg period was about 6| days, on May 18, and the 
shortest 3 days and 5 hours, on June 20. The average egg period 
for all lots is 4.92 days. 
Table XIV. — Length of egg stage of the plum curculio. New Richmond, Ohio, 1907. 
Eggs under 
observa- 
tion. 
\nnrnvi Average 
Date of mit P e P length Total egg length of 
deposition. Seeeltai days " e?g sta ? e - 
oi egg stage. by months 
39 
31 
Days. 
Mavl8.... 6.25 
Mav23.... 5.00 
Days. 
243. 75 
155. 00 
70 
398.75 5.69 
23 
June 17.... 4.00 
June 22.... 3.25 
92.00 
65.00 
43 
157. 00 3. 65 
Total number of eggs 113 
Total egg days 555. 75 
Average length of egg stage, days 4. 92 
Data were secured on the egg period at Siloam Springs, Ark., 
during late summer from August 15 to 25, the time varying from 
3^ to 6 days, the average of the 18 eggs for the period being 4.66 days. 
Some egg records made under out-of-doors conditions in the 
insectary yard, at Washington, 1908, are given in Table XV. The 
period included from May 7 to 22 was marked by abnormally low 
temperature, and its effect upon egg development is clearly shown. 
Table XV. — Length of egg stage of the plum curculio. Washington, D. C, 1908. 
Eggs under 
observa- 
tion. 
Date of 
deposition. 
Approxi- 
mate length 
of egg stage. 
Total egg 
day-. 
3 
1 
4 
5 
3 
1 
2 
1 
5 
3 
7 
1 
1 
3 
3 
1 
May 7 

8 
...do 
May 8-9... 
...db 
...do 
...do 
Ma v 9-10.. 
...db 
May lo-ll. 
...do 
May 11.... 
May 13.... 
May 13-14. 
May 14.... 
...do 
Dai/". 
11.00 
10.75 
9.75 
10.00 
9.50 
9.75 
10. 50 
10.75 
9.50 
8 ' 
8.00 
8.00 
7. 75 
33.00 
10. 7.'. 
39.00 
50. ixi 
a 
;i. ::, 
21.00 
10. 7:. 
28 
a - 
34.00 
24.00 
* 
415.25 
Total number of eggs 
Total egg days 
Average length of egg stage. 
. 
