SEASONAL HISTORY AT COMPTOX, CAL. 
35 
Table IX. — Length of prcpupal and pupal stages of the bean thrips at Comp- 
ton, Gal., during July, 1911. 
Exp 
No. 
Changed to prepupa. 
Changed to 
pupa. 
Date. 
July 1.. 
July 10 
July 11 
July 13 
/July 15 
\July 16 
(July 19 
IJuly 20 
Num- 
ber. 
Date. 
July 5 
7 
July 13 
3 
(July 14 
6 
July 15 
1 
July 14 
1 
July 15 
2 
July 17 
1 
July 18 
1 
July 23 
2 
July 24 
2 
Num 
ber. 
Adults 
emerged. 
Date. 
rjuly 11 
July 12 
July 18 
■July 18 
■July 19 
July 24 
July 24 
July 29 
July 29 
Num- 
ber. 
Length of stage. 
Pre- 
pupal. 
Pupal. Total 
Days. 
6-7 
4-5 
Days. 
10-11 
8 
Average 
mean 
tempera- 
ture. 
ri.7 
ro.i 
71.6 
6S.5 
During the month of August, 1910, at Los Angeles, CaL, larvae 
changed to prepupse August 2 and the adults emerged on August 9, 
requiring 7 days for the prepupal and pupal stages. For this period 
the average mean temperature at Compton, 10 miles out, was 72.4° F. 
Another lot changed to prepupye on August 7 and the adults emerged 
on August 15, giving a total of 8 days for the prepupal and pupal 
stages. The average mean temperature at Compton for the period 
was 71.4° F. 
For the latter part of August and for September the length of these 
stages is nearly that required in July. However, in October this 
time is lengthened to some extent. Larvae that changed to prepupa? 
on November 3, 1910, required until November 16 before the adults 
emerged, or a total of 13 days. The average mean temperature for 
the period was 59.9° F. 
Records made of the length of the prepupal and pupal stages for 
November and December, 1910, as given in Table X, show that at 
that time of year the period required was greatly prolonged, the 
prepupal stage requiring from 7 to 9 days and the pupal stage from 
20 to 24 days, making a total period of from 27 to 33 days. During 
this period the mean average temperature was 53.58° F. 
Table X. — Length of prepupal and pupal stages of the bean thrips for November, 
1910, at Compton, Cat. 
Exp. 
No. 
Changed to prepupa. 
Changed to pupa. 
Adults emerged. 
Length of stage. 
Date. 
Number. 
Date. 
Number. 
Date. 
Number. 
Pre- 
pupal. 
Pupal. 
Total. 
1 
Nov. 14 
1 
2 
7 
Nov. 21 
Nov. 23 
[Nov. 25 
{Nov. 26 
I or 27. 
1 
2 
1 i 
Dec. 12 
/Dec. 13 
\Dec. 15 
Dec. 15 
Dec. 17 
1 
1 
1 
1 
3 
Days. 
7 
} ' 
| 8-9 
Days. 
21 
20-22 
22-24 
Days. 
28 
2 
27-29 
3 
30-33 
Total. 
10 
9 
7 
