48 
Indian Forest Records. 
rvoL. vii. 
The life-cycles of individuals 1-4 were carried through on a sapling 
in the out-door cage, and of 5 and 6 in glass jars in moist earth. Indivi¬ 
dual No. 4 moulted to the second stage on the 13th June, but was injured 
by the scalpel when dissecting the shoot, and subsequently died. 
The length of the feeding period of the larva of the third generation 
may be summarized from the following complete cycles :— 
Date of Inoculation. 
Date of Pupation. 
Number of days in 
Larval period. 
June— 
5th. 
« 
1st August .... 
56 
8th. 
July— 
29th .... 
51 
8th. 
31st .... 
53 
12th. 
6th August— . 
56 
12th. 
7th „ ... 
58 
3. As a further check on insectary results, one of the toon trees in 
the Kesearch Institute Grounds was kept under special observation 
and affected shoots collected at regular intervals. Shoots collected on 
the 3rd June contained mostly early first stage larvse, which continued 
in abundance up to about the 10th June. On the 11th of the month 
second stage larvae made their appearance, together with a proportion of 
first stage individuals. Both stages were observed up till the 19th 
June. Third stage larvae were obtained on the 20th, and shoots collected 
from this date onwards until the 4th July were found to contain the 
first three stages of the robusta larva. On the 5th July the bluish- 
green larvae of the fourth stage were first observed, and continued regul¬ 
arly to be obtained until the 27th July. On the 28th July the first 
specimens of pupae were encountered; these individuals emerged as 
moths on the 12th August. 
From the evidence provided by this tree, we are justified in assum¬ 
ing that the lengths of the larval stages and the total length of the 
feeding period as obtained under insectary conditions represent, with 
sufficient accuracy, the normal development in the field. 
The results obtained of the experiments detailed above may be 
summarized, as far as the development is concerned, as follows :— 
Average number of days of the— 
First stadium . . . . . . . . = 8-2 
Second „ . . . . . „ . . ~ 9-0 
Third ..«15-0 
Fourth • —22-8 
L 
193 ] 
