168 
Journal of Agricultural Research 
Vol. XXXI, No. 2 
Table I. — Data on freezing of Bruchus obtectus 
UNEMERGED ADULTS 
Tem¬ 
pera¬ 
ture 
at 
start 
Time 
taken 
to 
reach 
0 °C. 
Time 
taken 
to 
reach 
super¬ 
cooling 
point 
Rate 
at 
which 
insect 
was 
cooled 
Super¬ 
cooling 
point 
Re¬ 
bound 
point 
Remarks 
Degrees 
per 
°C. 
Seconds 
Seconds 
minute 
°C. 
°C. 
2 
3 
18 
0.63 
-9.50 
-7.75 
18 
19 
35 
.55 
-8.75 
-5.80 
15 
19 
35 
.56 
-9.00 
-7.20 
5 . 
8 
29 
.40 
-8.40 
-5.85 
7.5 
14 
36 
.45 
-10.00 
-6.50 
5 
7 
32 
.36 
-9.00 
-6.75 
0 
23 
.41 
-9.50 
-5.00 
17 
26 
50 
.46 
-11.00 
-7.25 
14 
20 
43 
.35 
-8.00 
-4.25 
15 
28 
47 
.39 
-7.50 
-3.75 
8 
13 
34 
.37 
-7.75 
-4.30 
3 
15 
40 
.32 
-8.00 
-4.75 
10 
14 
35 
.36 
-7.50 
-3.75 
15 
14 
40 
.44 
-11.50 
-8.50 
13 
15 
36 
.41 
-8.60 
-4 80 
9 
7 
25 
.47 
-8.50 
-3.75 
12 
38 
-7.75 
-5.30 
8 
6 
19 
.58 
-7.60 
-4.50 
10 
13 
38 
.29 
-7.75 
-4.25 
1 
2 
6 
1.81 
-7.25 
-6.50 
13 
18 
43 
.38 
-9.50 
-5.75 
5 
14 
33 
.38 
-7.25 
-4.00 
10 
12 
28 
.45 
-7.25 
-3.50 
12 
16 
-8.75 
—7.25 
9.5 
9 
32 
.50 
-11. 50 
-7.75 
Average 
-8.68 
-5.55 
PUPAE 
15 
24 
61 
0.26 
-9.50 
-5.00 
Cream-colored. 
10 
12 
45 
.29 
-9.80 
-5.25 
Light brown; wings grayed. 
8 
11 
33 
.43 
-9.50 
-4.50 
Do. 
9 
11 
29 
.46 
-8.25 
-3.75 
Cream-colored. 
15 
15 
40 
.44 
-11.00 
-5.75 
Do. 
8 
9 
40 
.38 
-11.75 
-6.00 
Do. 
10 
14 
36 
.36 
-8.00 
-3. 75 
Cream-colored; wings grayed.. 
8 
13 
35 
.36 
-8.00 
-4 00 
Cream-colored. 
10 
15 
37 
.43 
-9.50 
-4 25 
Do. 
5 
3 
25 
.44 
-9.75 
-5.00 
Do. 
0 
55 
.23 
-12. 50 
-6.25 
Do. 
-6 
23 
.14 
-9.25 
-5.00 
Red-brown; wings black. 
12 
17 
45 
.34 
-9.60 
-5.80 
Cream-colored. 
5 
6 
21 
.52 
-7.75 
-4.80 
Red-brown; wings grayed. 
0 
28 
.35 
-9.70 
-5.20 
Cream-colored. 
14 
12 
40 
.32 
-9.00 
-5.75 
Do. 
8 
18 
40 
.29 
-6.50 
-4 25 
Red-brown; wings grayed. 
10 
25 
57 
.23 
-7.25 
-4.50 
Cream-colored. 
16 
18 
40 
.39 
-8.50 
-5.25 
Thorax black; wings black. 
11 
15 
45 
.33 
-9.75 
-6. 75 
Red-brown; wings gray. 
16 
20 
40 
.34 
-6.75 
-3.80 
Cream-colored. 
9 
15 
35 
.35 
-7.00 
-4.50 
Do. 
-5 
15 
.43 
-11. 50 
-5.25 
Do. 
5 
9 
26 
.53 
-9.00 
-6.75 
Do. 
0 
23 
.50 
-11. 50 
-7.00 
Do. 
Average 
-9.22 
-5.12 
