14 BULLETIN" 539, U. S. DEPARTMENT OF AGRICULTURE. 
LENGTH OF INCUBATION PERIOD. 
From Tables I and II it will be seen that the egg stage varies from 
three days in the summer time to five days in early fall, being influ- 
enced greatly by temperature conditions. In late fall, eggs were 
obtained that required from six to eight days to hatch. 
Table III. — Number of eggs deposited by 1 female of Elasmopalpus Ugnosellus in 
1 day and during life, at Columbia, S. C, 1915. 
Cage 15-1112. 
Cage 15-1113. 
Cage 15-1114. 
Date of oviposition. 
Number 
of eggs. 
Date of ovipo- 
sition. 
Number 
of eggs. 
Date of ovipo- i Number 
sition. of eggs. 
73 
11 
73 
61 
27 
39 
27 
15 
6 
4 
6 
Sept. 2-3 
Sept. 4 
Sept. 5 
Sept. 6 
Sept. 8 
Sept. 9 
Sept.(?) 
Sept. 10 
Sept. 11 
25 
36 
11 
5 
9 
7 
20 
9 
12 
Aug. 31 15 
June 16 
Sept. 1 
Sept. 2-3 
Sept. 4-5 
Sept.(?) 
Sept.9 
Sept. 10 
Sept. 11 
Sept. 12 
31 
38 
19 
GO 
22 
3 
3 
1 
June 21 
June 22 
June 23 
June 24 
June 26 
June 28 
Total 
342 
24.43 
134 
(?) 
192 
Average per day... 
! 
(?) 
1 
Cage 15-1115. 
Cage 15-1116. 
Cage 15-1117. 
Date of oviposition. 
Number 
of.eggs. 
Date of ovipo- 
sition. 
Number 
of eggs. 
Date of ovipo- 
sition. 
Number 
of eggs. 
Sept. 10 
53 
56 
38 
34 
1 
9 
2 
4 
Sept. 8 
Sept.9 
Sept. 10 
Sept. 11 
Sept. 12 
Sept. 14 
56 
35 
34 
33 
28 
8 
Sept. 13 
Sept, 14 
Sept. 15 
24 
55 
12 
Sept. 11 
Sept. 12 
Sept. 13 
Sept. 14 
Sept. 15 
Sept. 16 
Sept. 17 
Total 
197 
24.63 
194 
27.71 
91 
30.30 
Average per day... 
NUMBER OF EGGS DEPOSITED BY ONE INDIVIDUAL. 
The number of eggs deposited by one individual under laboratory 
conditions varies (as will be seen by referring to Table III) from 91 to 
342, with an average of 190. The small number deposited in Cage 
15-1117 was probably due to premature death of the female. 
The number of eggs deposited by one individual in any one day 
varies from 1 to 73. The daily average computed from the daily 
average of the four cages in Table III is about 26.77 eggs. 
In two other experiments conducted in July, 1914, 188 eggs were 
obtained in one cage and 311 eggs in the other. 
