THE CADELLE 
21 
indicate to be fairly trustworthy as complete oviposition records for 
females emerged before May 25 and reaching their egg-laying ca- 
pacity before the winter following. 
The maximum number of eggs deposited by any cadelle under 
observation is 1,319; the minimum, 436. The 14 females whose rec- 
ords are included in Table 2 laid 530, 1,190, 436, 1,311, 605, 1,087, 990, 
931, 493, 1,319, 987, 1,182, 916, and 757 eggs, respectively. The 10 
females depositing the largest number of eggs deposited an average 
of 1,067 eggs; whereas the average for the entire 14 females of Table 
2 is about 910 eggs. The number of eggs laid at a time varied from 
3 to 78. In one instance, not recorded in Table 2, a female beetle 
deposited 91 eggs in a single batch. 
THE EGG 
The incubation period of the egg varies considerably, being in- 
fluenced chiefly by the prevailing temperatures. The data of Table 3 
indicate the length of the egg stage as determined by the writers 
under laboratory conditions when the mean temperatures ranged 
from 69.2° to 85° F. It will be noted that during February and 
March, 1923, when the mean temperatures ranged from 70° to 71° F., 
the length of the incubation period was from 15 to 17 days. Later in 
the spring and in the summer (1922), as the daily means rose, the 
length of the incubation period became shorter until with an average 
mean of 80°-85° F., it was reduced to a minimum of 7 days. The 
data of Table 3 cover those portions of the year when the adult 
cadelle oviposits in the laboratory at Washington, D. C, and indi- 
cate a minimum incubation period of 7 days and a maximum of 
17 days. 
Table 3. — Incubation period of egg of the cadelle 
No. 
Date egg 
laid 
Date egg 
hatched 
Length 
of incu- 
bation 
period 
Average 
mean 
temper- 
ature for 
incuba- 
tion 
period 
1 
Apr. 27,1922 
May 6, 1922 
May 7,1922 
June 5, 1922 
June 6, 1922 
June 7, 1922 
June 16, 1922 
May 7, 1922 
May 15, 1922 
May 16, 1922 
June 12, 1922 
June 13,1922 
June 14,1922 
June 23,1922 
July 10,1922 
Aug. 11,1922 
Oct. 15,1922 
Oct. 17,1922 
Mar. 13, 1923 
Mar. 13, 1923 
Mar. 14, 1923 
Mar. 17, 1923 
Mar. 22, 1923 
Apr. 6, 1923 
Apr. 14,1923 
Apr. 20,1923 
Apr. 27,1923 
May 2,1923 
May 28, 1923 
June 1,1923 
Days 
10 
9 
9 
7 
7 
7 
8 
10 
10 
17 
16 
15 
15 
16 
15 
12 
14 
14 
13 
10 
9 
o p 
71.4 
2 
74.2 
3 
74.5 
4 
85 
5 
■ 84 3 
6 
83 
7 
80 
8 
July 3, 1922 
80.5 
9 
Aug. 3, 1922 
Oct. 5, 1922 
Oct. 7, 1922 
Feb. 24,1923 
Feb. 25,1923 
Feb. 27,1923 
Mar. 2,1923 
Mar. 6,1923 
Mar. 22, 1923 
Apr. 2, 1923 
Apr. 6, 1923 
Apr. 13,1923 
Apr. 19,1923 
May 18, 1923 
May 23, 1923 
79 
10 
74 
11 
73 
12 
71 
13. 
71 
14 
71 
15 
71 
16,. 
70.8 
17 . .. 
70 
18 
71 
19 
20 
70.6 
21 
72 
22 
76 
23 
77.4 
