THE CITRUS WHITE FLY: LIFE HISTORY AND HABITS. 
73 
of the tender growth, are favorite places for oviposition, and not 
infrequently as high as 40 per cent of the eggs are there laid, even 
when the adults are not very abundant. Although eggs may be 
deposited along the leaf margin, it is seldom that they are laid on the 
margin itself, as is the case with the cloudy-winged white fly. Even 
when not crowded for leaf space, the adults sometimes settle upon the 
under side of young fruit, where they deposit eggs freely and appar- 
ently feed. 
DAILY RATE OF OVIPOSITION. 
Previous to these investigations no data have been published on 
the daily rate of oviposition. In obtaining the data given in Table 
XII, the females recorded were collected at random throughout the 
grove, without regard to age, and, together with males not mentioned, 
were caged over leaves cleaned of all eggs and larvae of the white 
fly and allowed to remain the recorded time, when the adults were 
removed and the eggs counted. 
Table XII. — Daily rate of oviposition of the citrus white fly. 
Record 
No. 
Date deposited. 
Number 
of 
females. 
Duration 
of egg 
laying. 
Number 
of eggs 
depos- 
ited. 
Average 
number 
of eggs per 
female 
per 24 
hours. 
Average 
mean 
tempera- 
ture. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
Feb. 23-24, 1909 
Apr. 11-15, 1907 
Apr. 20-21, 1909 
Apr. 21-22, 1909 
June 16-17, 1909 
July 17-18, 1907 
July 22-23, 1907 
July 24-26, 1907 
Aug. 17-18, 1907 
Sept. 21-22, 1908 
14 
3 
50 
40 
30 
255 
105 
50 
70 
35 
Hours. 
26 
103 
24 
24 
24 
21 
24 
46 
24 
24 
197 
98 
454 
405 
360 
2,533 
1,216 
1,331 
805 
405 
13 
7.6 
9.1 
10.1 
12 
11.3 
11.6 
13.8 
11.5 
11.6 
° F. 
* 74.5 
68.2 
77.2 
78.2 
82 
82 
85 
84 
81 
79 
Number eggs per day per female, grand average, 11.2. 
The generally uniform results obtained in the nine records when 
the average mean temperature was about 75° F. or above, together 
with the grand average daily rate of oviposition for individual 
females whose age was definitely known, as shown in Table XIII, 
indicate that each female normally deposits on an average 10 or 11 
eggs a day. Varying degrees of temperature above a daily mean 
of 75° F. do not correspondingly increase the number of eggs 
deposited. However, temperatures below an average mean of 72° F. 
(estimated) have a distinct checking effect upon oviposition, as shown 
by record No. 2. 
Notwithstanding the general average number of eggs per day 
deposited by the females of all ages in Table XII, and the same for 
the females of known ages for the total number of days they lived, 
in Table XIII, reference to the daily oviposition records in the latter 
