58 
Indian Forest Records. [Vol. VII. 
Table 31 .—Stages of the Fifth Generation in the Field, 1914. 
Date of Observation. 
No. of 
trees 
examined. 
Contents 
OF INFESTED 
SHOOTS. 
Totals. 
Live 
larvse. 
Dead 
larvse. 
Parasitised 
larvse. 
Live 
pupse. 
Empty 
Pupse. 
27th February 
29 
35 
7 
7 
1 
6 
55 
4th March .... 
38 
9 
3 
6 
10 
3 
31 
17th „ .... 
30 
2 
3 
9 
1 
15 
3rd and 4th April 
53 
1 
“2 
3 
11 
10 
27 
24th and 25th April 
74 
15 
2 
36 
53 
From the observations recorded, it is concluded that, (1) at the end 
of February the general stage of the generation is that of the mature 
hibernating larva ; a few early individuals have emerged as moths (one 
was observed emerging on the 27th February) ; (2) a week later, pupae 
are met with as numerously as larvae ; (3) on the 17th March the 
genera] stage is that of the pupa, with a few late larvae ; (4) early in 
April, pupae and moths are equally numerous, and (5) in the third 
week of April, the general stage is that of the moth. 
At the latter end of 1914 field collection was carried out regularly, 
but the greater part of the material gave negative results. Many of 
the larvae taken in November and December were found to be dead, 
killed apparently by cold, and the remainder were either parasitized 
or attacked by a mummifying fungus. 
1915 . The field collection was continued in January and February 
under the same adverse conditions. Out of a total of 400 shoots collected, 
300 were found to contain dead larvae and of the remainder a large 
number died as a result of desiccation.* The moth emergence dates 
from this material are given in Table 2. 
Throughout October, November and December 1915, toon shoots 
were collected for laboratory examination. From the 6th October up 
to the 10th November eggs, first, second, third and fourth stage larvae 
of the fifth or overwintering broods were obtained. After the 10th 
November, all the shoots collected contained bluish-green larvae of the 
fourth stage. 
1916 . The shoots brought in by collectors during January, March, 
if infested, contained hibernating larvae of the fourth stage in chamber 
closed by a partition of silk. 
Insectary work .—The development of the fifth brood of larvae was 
determined by inoculation experiments analogous to those carried 
out for the 3rd and 4th generations. The results are given in Table 32. 
* Note.— At this period the offices ol the Forest Zoologist were transferred from 
the old quarters to the New Research Institute building and many experiments in 
progress had to be abandoned. 
[ *03 ] 
