26 
The Bulletin 
again in tlie evening. In most of the cases, as will be seen from the 
above figures, the eggs hatched about noon on the fourth, fifth, sixth, 
and seventh days following the night on which they were laid. 
Frequently eggs laid the same night in the same piece of corn and 
stored in the same tin box under what must obviously he the same 
conditions hatched at varying times from 102 to 174 hours. 
This point was made a special issue for field experiment during the 
summer of 1914, and while no definite data could be secured, owing 
to the fact that the eggs were buried in the stalk where they could not 
be observed, yet females were watched ovipositing and the egg marked 
as carefully as possible and then examined three, four, five, six, and 
seven days later. Most of these eggs were laid in the morning between 
5 and 8 o’clock and most of them were examined in the evening between 
4 and 6; hence our results are not much closer than twelve hours. But 
out of twenty-three eggs examined in this way, fairly close time was 
secured on only six, the shortest observed time was 130 hours and the 
longest recorded time was 177 hours. The other four eggs that had 
hatched when examined and near which young larvae were discovered 
were found in the evening of the sixth day after they were laid, giving 
a total time of about 154 hours from the time they were laid. 
These figures agree very well with the figures as from the following 
tables. 
Table II. 
INCUBATION RECORD OF 53 LOTS OF EGGS HATCHED IN THE INSECTARY DURING 
THE SUMMER OF 1911. 
Lot No. 
No. of Eggs 
Number of Hours Required for Hatching 
Minimum 
Maximum 
Average 
1 
6 
151 
161 
156 
2 
1 
150 
160 
155 
3 
2 
156 
160 
158 
4 
4 
168 
178 
173 
5 
1 
174 
184 
179 
6 
1 
188 
195 
192 
7 
1 
193 
205 
199 
8 
2 
170 
183 
177 
9 
1 
170 
183 
177 
10 
1 
158 
169 
164 
11 
1 
150 
166 
158 
12 
5 
123 
147 
135 
13 
5 
141 
165 
153 
14 
4 
127 
151 
139 
15 
1 
186 
192 
189 
16 
26 
148 
164 
156 
17 
5 
139 
143 
141 
18 
1 
305 
329 
317 
19 
4 
137 
141 
139 
20 
3 
161 
165 
163 
21 
1 
141 
, 142 
142 
22 
3 
161 
163 
162 
