Gr. H. F. Nuttall 
445 
Observations relating to oviposition of li. bursa. 
Fertilized ?s. 
nate wlien ? 
Days ? sur¬ 
vived after 
No. of 
$ main¬ 
). of Lot 
dropped from 
host 
Oviposition 
began after 
Oviposition 
lasted 
oviposition 
ceased 
eggs laid 
per ¥ 
tained 
at ca. 
Kemarks 
t gen. 
?2 
4. 
V. 1912 
11 days 
33 days 
3 days 
24° C. 
Females 
3 
13. 
99 
8 
35 
7 
•— 
99 
1 and 9 
4 
99 
9 
43 
2 
— 
99 
died 
5 
>> 
99 
8 
35 
3 
— 
99 
without 
6 
14. 
99 
9 
45 
24 
— 
99 
laying 
7 
15. 
99 
17 
— 
— 
— 
99 
eggs. 
8 
>> 
99 
10 
36 
4 
— 
99 
lu 
10. 
99 
8 
24 
2 
— 
99 
11 
it 
99 
11 
34 
12 
— 
99 
12 
91 
•9 
10 
38 
4 
— 
99 
13 
99 
9) 
13 
— 
— 
— 
99 
14 
99 
;9 
10 
35 
1 
— 
99 
15 
19. 
10 
33 
26 
6306 
20° C. 
l(j 
99 
99 
8 
40 
24 
6276 
99 
17 
31. 
vn. 
13 
44 
40 
4959 
18° C. 
18 
99 
99 
11 
46 
40 
6470 
if 
19 
■9 
99 
11 
44 
— 
5736 
99 
20 
99 
99 
10 
48 
23 
6860 
99 
21 
99 
99 
10 
47 
17 
6888 
99 
22 
99 
11 
45 
32 
6206 
99 
23 
99 
99 
9 
46 
44 
6099 
99 
24 
99 
99 
10 
46 
28 
6612 
99 
25 
99 
IT 
10 
48 
33 
— 
99 
26 
99 
9f 
10 
46 
40 
— 
99 
27 
99 
ft 
11 
43 
9 
— 
99 
28 
99 
99 
14 
31 
5 
— 
99 
29 
99 
99 
9 
29 
1 
— 
The duration of oviposition is not markedly influenced by variations 
of temperature within the limits 18-24° C.; a glance down the fourth 
column of the table shows, however, that at 18-20° C. the process is 
usually somewhat prolonged as compared to what takes place at 24° C.; 
shorter pre-oviposition periods also tend to occur at 24° C. than at 
18-20° C. Within this range of temperature then, the pre-oviposition 
period lasts 8-17 days, the oviposition period 24-48 days. 
Regarding artificially induced parthenogenesis in R. bursa see the 
paper which follows (p. 457). 
29—2 
