58 
The Bulletin 
Record 
Number 
Date of 
Hatching 
Date 
cf Shedding 
Date of 
Pupating 
Number 
Days 
Larval 
Stage 
1st Molt 
2d Molt 
3d Molt 
4th Molt 
205 
July 
20 
July 
28 
July 
31 
? 
Aug. 
6 
Aug. 
24 
35 
206 
July 
20 
July 
24 
July 
31 
Aug. 
3 
Aug. 
11 
Aug. 
24 
35 
207 
July 
20 
? 
July 
30 
Aug. 
4 
? 
Aug. 
24 
35 
208 
July 
20 
July 
24 
July 
31 
Aug. 
2 
Aug. 
6 
Aug. 
24 
35 
209 
July 
22 
? 
July 
31 
Aug. 
7 
Aug. 
14 
Aug. 
21 
30 
210 
July 
22 
? 
July 
31 
Aug. 
3 
Aug. 
9 
Aug. 
20 
29 
211 
July 
22 
July 
26 
? 
Aug. 
7 
Aug. 
11 
Aug. 
23 
32 
212 
July 
22 
? 
July 
31 
? 
Aug. 
9 
Aug. 
21 
30 
213 
July 
24 
July 
31 
Aug. 
4 
? 
? 
Aug. 
16 
23 
214 
July 
26 
July 
31 
Aug. 
4 
Aug. 
9 
Aug. 
14 
Aug. 
29 
34 
215 
July 
26 
? 
Aug. 
2 
Aug. 
4 
? 
Aug. 
26 
31 
216 
July 
26 
July 
31 
Aug. 
2 
Aug. 
6 
? 
Aug. 
29 
34 
217 
July 
26 
July 
31 
Aug. 
2 
Aug. 
4 
Aug. 
7 
Aug. 
29 
34 
218 
July 
26 
July 
31 
Aug. 
2 
Aug. 
6 
Aug. 
11 
Aug. 
23 
28 
219 
July 
27 
July 
31 
Aug. 
2 
Aug. 
6 
? 
Aug. 
18 
22 
220 
July 
27 
? 
? 
Aug. 
4 
Aug. 
9 
Aug. 
26 
30 
221 
July 
27 
July 
31 
Aug. 
4 
Aug. 
6 
Aug. 
12 
Aug. 
22 
26 
DURATION OF THE MOLTS 
(First Molt, Fig. 19) 
In all, 150 first molts have been recovered from the 221 larvie that 
have been reared from the egg to the pupa. The duration from the 
date of hatching to the first molt ranged from two to twelve days, the 
extremes occurring once each. The greatest number, 105 out of the 
150 or approximately 70 per cent, molted between the third and fifth 
day. This is expressed graphically by the curve (Fig. 32). From these 
figures it seems safe to conclude that usually the first molt occurs some 
time between the third and fifth day from the hatching of the egg, but 
it may be greatly prolonged, due, perhaps, in most cases to poor food, 
and first molts occurring six, .seven, and eight days after hatching are 
not usual, and the first molt may occur as long as twelve days after 
hatching. 
There is perhaps greater regularity in the occurrences of the first 
molt than there is in any of the succeeding molts, due, perhaps, to the 
fact that the larva lias had less time than in its later molts to he in¬ 
fluenced by its environment, especially by favorable or unfavorable food 
supply. 
The other factor that cannot he neglected in this matter i,s the fact 
that any irregularities in the first or succeeding molts are of necesvty 
cumulative, that is to say, the chances are that any larvse that molt a 
few days early or a few days late in the first molt would also molt 
irregularly for the second and succeeding molts; hence these irregu- 
