20 BULLETIN 1393, U. S. DEPARTMENT OF AGRICULTURE 
Table 3. — Daily rate of oviposition of the granary weevil — Continued 
Date of 
oviposition 
Weevil number and oviposition record 
Daily 
mean 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
tem- 
pera- 
ture 
1922 
July 25 
1 
1 
1 
1 
1 
2 
1 
° F. 
80 
26 
75 
27... 
1 
1 
77 
28... 
81 
29... 
79 
30... 
1 
79 
31— 
77 
78 
2 
1 
77 
4... 
77 
6 
1 
80 
8 
78 
9 
72 
23.. 
75 
25 . . 
76 
Sept. 1 
76 
3 . 
75 
5 
80 
9 
77 
10 
78 
14 
74 
15 
77 
17 
70 
19 
68 
20... 
69 
23. . 
70 
24... 
73 

Total eggs... 
6S 
71 ' 145 
128 
130 
"S 
130 242 
78 
108 
l'.f, 
30 135 
1 
126 
234 
181 184 74 
,u 
200 
177 166 
210 95 
During the experiments recorded in Table 3 the average moisture 
content of the grain (corn) was about 12 to 14 per cent. It will be 
noted that from one to five eggs were laid per day when oviposition 
took place; 58.4 per cent of the 2,199 records of oviposition were for 
one egg per day, 33.4 per cent for two eggs per day, 7 per cent for 
three eggs per day, 0.9 per cent for four eggs per day, and 0.3 per 
cent for five eggs per da v. On the 5 days when five eggs per day 
were laid the mean temperatures were 70 6 , 70°, 68°, 69°, and 75° F. 
and not more than two of the females under observation deposited 
so large a number of eggs on any one day. On the 19 days when 
four eggs were deposited each dav, the mean temperatures were 70°, 
67°, 69°, 65°, 64°, 67°, 67°, 68°", 70°, 70°, 70°, 66°, 66°, 70°, 70°, 
70°, 68°, 80°, and 67° F. The more usual number of eggs deposited 
per day appears to be one or two. In one instance when the mean 
temperature fell as low as 58° F., 6 females deposited one egg each, 
16 females deposited two eggs each, and 1 female deposited three 
eggs. When these records were made (April 2) the female weevils 
were in the midst of spring activity. Earlier in the year, on February 
20, when the mean temperature was 58° F., but at the beginning 
of spring oviposition, 9 females deposited one egg each and only 1 
female two eggs. One female, No. 20, on two occasions deposited 
three eggs for four consecutive davs when the temperature means 
were 69°, 66°, 68°, and 67° F., and 7,5°, 74°, 75°, and 74° F. It is 
interesting to note, however, that during the latter period of four 
days when a second female (No. 3) also deposited three eggs each 
day, other records show but one egg deposited in 32 instances, two 
eggs in 19 instances, and three eggs in only 1 instance. A female, 
No. 11, deposited only a single egg per day on the 39 oviposition 
