*4 Indian Forest Records. [Vol. VII. 
individuals. The fourth stage includes the time occupied in the con¬ 
struction of the cocoon. 
Table 4. —Length of the Larval Stages of the First Generation , 1916. 
Individual Serial 
Number. 
Number of days passed in 
Length of 
Feeding 
period. 
1st Stage. 
2nd Stage. 
3rd Stage. 
4th Stage. 
1 
2 
2 
3 
3 
10 
o 
3 
2 
2 
3 
10 
3 
3 
2 
2 
4 
11 
4 
2 
2 
2 
4 
10 
5 
4 
2 
2 
3 
11 
6 
3 
2 
2 
4 
11 
7 
1 
2 
2 
4 
9 
8 
4 
2 
2 
4 
12 
9 
3 
2 
2 
4 
12 
10 
4 
2 
2 
4 
12 
11 
4 
2 
2 
4 
12 
12 
2 
2 
2 
4 
10 
13 
2 
2 
2 
3 
9 
14 
3 
2 
2 
3 
10 
15 
2 
2 
2 
3 
10 
16 
4 
2 
2 
4 
12 
17 
4 
2 
2 
4 
12 
18 
2 
2 
2 
4 
10 
19 
3 
2 
2 
4 
11 
20 
2 
2 
2 
4 
10 
The first stage occupies on the average 2-85 days, the second stage 2-00 days, the 
third stage 2*10 days, and the fourth stage 3-70 days. 
The length of the feeding period of the first generation larva is given 
in the last column of Table 4. The shortest length of the feeding period 
is 9 days and the longest 12 days ; the average of 20 records is 10*7 days. 
The larva takes 1—2 days in preparing the cocoon preparatory to pupa¬ 
tion during which no food is taken. The majority of the first stage 
larvae collected for the above experiment were 1—2 days old (i.e. 3 from 
hatching of the eggs); this amount should therefore be added to the 
length of the feeding period in captivity. The total normal length of 
the feeding period is therefore 9*7—10-7 days. 
The colour changes in the instars of this generation, as observed in 
the feeding experiments of 1916 and again in 1917, are similar to those 
of the larvae of the second generation (vide p. 28). 
The seasonal history of this generation was not studied in the field in 
1915, but in 1916 the swarming of the mature larvae prior to pupation 
was determined by means of sack-band records. As the data for this 
generation are continuous with those of the second generation, they are 
given under that section (vide infra p. 32). 
[ 169 ] 
