6l 2 
Journal of Agricultural Research 
Vol. XXVI, No. i 
approach the regularly decreasing numbers of eggs as summarized in 
Figure i. During the period over which the eggs were laid the mean 
temperature, approximated by using the daily maxima and minima, 
was 66° F. 
Table II gives a condensed analysis of the lives of the 61 pairs of 
weevils, their oviposition, and the development of their progeny: 
Table II .—Life history records of 61 pairs of Bruchus quadrimaculatus, together with 
a summary of the results of their oviposition , September 18 to October 15, igig 
6 
Z 
•5 
* 
Date parent weevils emerged 
and mated. 
Adult life 
of parent 
weevils. 
Eggs. 
Emergence of 
progeny. 
Developmental 
periods of progeny. 
Male. 
Female. 
3 
Hatched. 
Produced adults. 
Males. 
i 
*3 
I 
Minimum. 
Maximum. 
Average. 
Num- 
Per 
Per 
Num- 
Num- 
Days. 
Days. 
ber. 
cent . 
cent . 
ber. 
ber. 
Days 
Days . 
Days • 
1. 
Sept. 17 
II 
16 
99 
48 
32 
22 
IO 
98 
171 
122 
2. 
17 
13 
16 
76 
80 
71 
28 
26 
94 
153 
107 
3 . 
17 
II 
11 
74 
85 
73 
25 
29 
9 i 
177 
1 13 
4. 
18 
16 
17 
ii 5 
56 
43 
28 
22 
9 i 
164 
121 
5 . 
18 
IO 
17 
106 
81 
6S 
32 
37 
96 
181 
117 
6. 
18 
IO 
13 
106 
85 
81 
47 
39 
93 
179 
112 
7 . 
18 
12 
12 
85 
66 
45 
22 
16 
99 
188 
132 
8.. 
19 
14 
18 
93 
78 
62 
34 
24 
100 
193 
124 
9 . 
19 
12 
12 
7 i 
73 
68 
27 
21 
93 
167 
Il8 
10. 
19 
14 
14 
82 
73 
65 
27 
26 
100 
205 
123 
11. 
^9 
14 
14 
93 
80 
68 
29 
34 
98 
132 
114 
12. 
20 
II 
13 
81 
85 
79 
36 
28 
95 
188 
120 
13 . 
20 
13 
14 
84 
56 
50 
23 
19 
96 
153 
Il6 
14 . 
20 
9 
15 
85 
55 
46 
20 
19 
96 
154 
120 
15 . 
20 
14 
l6 
85 
75 
64 
27 
27 
95 
181 
126 
16. 
20 
13 
17 
81 
77 
72 
28 
30 
95 
167 
117 
17 . 
20 
14 
14 
97 
7 i 
55 
29 
24 
97 
172 
128 
18. 
21 
14 
14 
95 
63 
55 
28 
24 
IOI 
216 
132 
r 9 . 
21 
11 
14 
7 i 
76 
66 
25 
22 
IOI 
175 
I29 
20. 
21 
14 
14 
90 
54 
42 
26 
12 
102 
216 
140 
21. 
21 
16 
l6 
96 
77 
72 
30 
39 
98 
165 
119 
22. 
21 
11 
18 
87 
72 
63 
27 
28 
98 
164 
H 9 
23. 
21 
17 
l6 
61 
44 
34 
11 
IO 
104 
173 
124 
24. 
21 
13 
l8 
75 
80 
75 
32 
24 
103 
179 
126 
25. 
21 
17 
14 
77 
79 
68 
27 
25 
109 
179 
126 
26. 
21 
15 
14 
81 
70 
63 
27 
24 
102 
194 
129 
27. 
21 
15 
l8 
92 
49 
4 i 
16 
22 
112 
170 
130 
28. 
21 
15 
14 
91 
53 
43 
18 
21 
IOI 
153 
119 
29. 
21 
13 
14 
91 
38 
35 
18 
14 
98 
164 
122 
30 . 
21 
11 
14 
82 
73 
70 
34 
23 
99 
167 
125 
3 i. 
21 
14 
15 
74 
72 
65 
32 
16 
104 
194 
127 
32. 
21 
16 
l6 
78 
62 
45 
20 
15 
105 
184 
130 
33 . 
21 
13 
l8 
95 
72 
59 
30 
26 
102 
198 
132 
34 . 
22 
i 5 
17 
99 
7i 
67 
28 
38 
103 
168 
120 
35 . 
22 
15 
l6 
73 
64 
60 
21 
23 
105 
158 
124 
36 . 
22 
IO 
14 
88 
81 
53 
20 
27 
hi 
I 79 
130 
37 . 
22 
9 
C) 
64 
47 
39 
18 
7 
103 
147 
12 I 
38 . 
22 
13 
l6 
81 
73 
58 
24 
23 
102 
161 
122 
39 . 
22 
12 
13 
74 
84 
62 
25 
21 
102 
*43 
121 
40 . 
22 
12 
18 
7i 
89 
72 
32 
19 
102 
159 
122 
4i . 
22 
7 
15 
81 
70 
5i 
23 
18 
108 
205 
128 
Escaped. 
