SEASONAL HISTORY AT COMPTON, CAL. 
33 
Table V. — Length of larval stage of the beau thrips, Compton, CaL, March and 
May, 1911. 
Date larvse hatched. 
Number 
of larvae 
hatched. 
I^arvse pupating. 
Length stage. 
Average 
mean 
Date. 
Number. 
Minimum. 
Maximum. 
tempera- 
ture. 
Mar. 19 
8 
7 
15 
14 
(Apr. 5 
{Apr. 6 
Upr. 7 
May 24 
/May 26 
\May 27 
May 27 
1 
2 
i 1 
1 
4 
1 
4 
Days. 
1 ■ 
10 
} «• 
9 
Days. 
19 
1 " 
11 
°F. 
61.5 
May 16 
62.1 
May 18. . . . 
62.1 
1 Rest killed by heat. 
During June and the first part of July this method of rearing 
larvse to secure the length of instars was repeated, with the results 
shown in Table VI. 
Table VI. — Length of larval stage of the bean thrips in June and the first part 
of July, 1911, Compton, Gal. 
Exp. 
Eggs hatched. 
Larvse pupated. 
1 Total 
Duration of stage. 
Average 
mean 
No. 
Date. 
Number. 
Date. 
pupated. 
Number. 
Minimum. 
Maximum. 
tempera- 
ture. 
1 
5 
50 
50 
50 
/June 28 
\July 1 
(July 10 
{July 11 
lJulv 12 
/July 11 
\July 12 
July 13 
it u 
i} " 
3 3 
Days. 
13 
11 
11 
12 
Days. 
16 
13 
12 
°F. 
63.9 
(June 29 
2 
(June 29 
I" 66. 7 
(july 1 
> 
Here the minimum for the larval stage was 11 days and the maxi- 
mum 14 days. 
In July larvae were reared from eggs laid in normal growing 
plants, situated in an outdoor insectary under normal conditions. 
These experiments are all given in Table VII. 
Table VII. — Length of larval stage of the bean thrips in July, 1911, at Compton, 
Cal. 
Exp. 
Eggs hatched. 
Date and number of larvse 
pupating. 
Total 
larvse 
pupat- 
ing. 
Length of larval stage. 
Average 
mean 
No. 
Date. 
Number. 
Minimum. 
Maximum. 
tempera- 
ture. 
1 
2 
(Julv 23 
{Julv 24 
[July 25 
(July 24 
{July 25 
[July 26 
/July 28 
\July 29 
5 
54 
16 
26 
18 
9 
8 
15 
) July 31, 85 larvse feeding; Aug. 
\ 2, all but 10 left plant to pu- 
1 pate; Aug. 5, 10 prepupse. 
(Aug. 2, all larvse left plant to 
1 pupate in cracks. These lar- 
vse were feeding from 7 to 9 
I days and then left the plant. 
1 85 
Days. 
10 
Days. 
12 
° F. 
68.8 
68.8 
1 
} 65.4 
3 
Aug. 9, number of larvse pu- 
pated. 
11 
