- 17 
Table 6. — Duration of the pupal period of larvae of Hy pera brunneipennis 
reared 
on alfalfa. 
hubam, and 
sourclover, Yuma, Ariz 
. , 1940 
Length o 
f pupal 
period.. 
(days) 
Prepupal 
stage 
Pupal 
stage 
Larval 
Date 
Range 
Mean 
Range 
Mean 
Range 
Mean 
food 
first cocoon 
Alfalfa 
2/28 
4-11 
4.9 
9-14 
10.2 
13-18 
15.1 
Hubam 
2/29 
4-15 
4.2 
11-17 
11.1 
15-21 
15.3 
Sourclover 
2/28 
4-11 
4.0 
8-16 
9.0 
12-20 
13.0 
Alfalfa 
3/6 
4-9 
4.0 
9-11 
9.9 
13-15 
13.9 
Hubam 
3/10 
5-9 
5.2 
6-10 
6.5 
11-15 
11.7 
Sourclover 
3/6 
4-15 
4.2 
9-15 
7.6 
13-19 
11.8 
Alfalfa 
3/15 
2-8 
3.7 
6-10 
5.6 
8-12 
9.3 
Hubam i 
— 
— 

— 


— 
Sourclover 
3/17 
4-12 
2.1 
6-11 
6.2 
10-15 
8.3 
Alfalfa 
3/21 
2-6 
2.5 
6-12 
6.6 
8-14 
9.1 
Hubam 
3/23 
2-6 
3.1 
6-13 
7.7 
8-15 
10.8 
Sourclover 
~ 
— 
~ 


~ 
Alfalfa 
3/29 
4-9 
4.1 
7-9 
6.4 
11-13 
10.5 
Hubam 
3/31 
2-4 
3.4 
7- 
6.3 
9- 
9.7 
Sourcloverz 
__ 
— 

~ 

— 
Alfalfa 
4/7 
4-6 
3.9 
2-7 
2.3 
6-11 
6.2 
Hubam 
4/9 
2-6 
1.8 
4-9 
5.0 
6-11 
6.8 
Sourclover 
4/7 
2-6 
2.3 
4-9 
4.0 
6-11 
6.3 
1/No cage established 
2/Larvae died before cocooning 
Table 7. — Abundance and development of Hy2§ia brunneipenni s cocoons per 
square foot on sourclover, showing effect of mortality upon 
production of adults, Yuma, Ariz., March to May, 1940 
Contents 
living 
Number of 
Date 
Percent 
Contents 
Total 
new adults 
sampled 
Total 
pupated 
deadi 
(all) 
emerged 
Mar. 13 
3.71 
50.00 
0.14 
3.85 
0.29 
Mar 20 
8.71 
66.18 
1.00 
9.71 
0.71 
Mar 27 
3.29 
39.39 
1.43 
4.72 
1.14 
Apr, 2 
3.29 
30.77 
0.57 
3.86 
1.57 
Apr. 10 2 
7.00 
73.21 
6.63 
13.63 
2.00 
ARr. 16 
5.38 
88.37 
11.00 
16.38 
2.75 
Apr. 22 
0.38 
100.00 
4.25 
4.63 
4.00 
Apr. 29 

__ 
2.25 
2.25 
3.88 
May 6 

~ 
0.29 
0.29 
1.00 
1/Total dead from all mortality factors. 
2/Clipping growth on April 3 hastened cocooning of many maturing larvae, 
