The Bulletin 
45 
the egg-shell is actually eaten away by the larva, that fact could not 
be seen with the aid of a binocular microscope giving a magnification of 
74 diameters. 
Soon after hatching, the young larva commences to eat a tunnel 
downward and toward the center of the stalk. 
PERCENTAGE OF EGGS HATCHING 
During 1915, 37 different lots of eggs, making a total of 566 eggs, 
were watched in the insectary to determine the percentage of eggs that 
hatched. These eggs were placed in small tin boxes with sufficient 
green corn to give them plenty of moisture. Of the 566 eggs, 433 
hatched, giving 76 per cent hatching. No reason can he assigned for 
the failure of the 24 per cent to hatch. All eggs that had not hatched 
by the end of nine days after laying were discarded and counted as not 
hatching, as they had usually molded by this time. No attempt has 
been made to compare this with conditions in the field, because no satis¬ 
factory method could be devised for watching the eggs under natural 
conditions. 
Table IX. 
36 LOTS OF EGGS OBSERVED IN THE INSECTARY DURING 1915 TO DETERMINE PER¬ 
CENTAGE HATCHING. 
Lot Number 
Number of Eggs 
Hatched 
Not Hatched 
Date Laid 
1 
24 
15 
9 
June 13 
2 
20 
17 
3 
14 
3 
22 
18 
4 
15 
4 
23 
13 
10 
16 
5 
19 
9 
10 
17 
6 
19 
15 
4 
18 
7 
22 
17 
5 
20 
8 
16 
15 
1 
21 
9 
14 
14 
0 
22 
10 
17 
10 
7 
23 
11 
16 
12 
4 
24 
12 
12 
12 
0 
25 
13 
13 
9 
4 
26 
14 
14 
8 
6 
27 
15 
19 
15 
4 
28 
16 
21 
19 
2 
29 
17 
17 
17 
0 
30 
18 
21 
18 
3 
July 1 
19 
19 
16 
3 
2 
20 
13 
12 
1 
3 
21 
14 
7 
7 
4 
22 
13 
10 
3 
5 
23 
15 
12 
3 
6 
24 
15 
12 
3 
7 
25 
13 
10 
3 
8 
26 
11 
10 
1 
9 
27 
9 
8 
1 
10 
28 
14 
9 
5 
11 
29 
11 
7 
4 
12 
30 
14 
11 
3 
13 
