46 
Indian Forest Records. 
[Vol. VII. 
concealed within the superficial tissue ; the insect continued to bore 
in at this rate until it disappeared in a gallery extending towards the 
centre of the shoot, or in an irregular depression partially covered 
with excreta and fragments of plant tissue. 
The inoculated shoots were examined on alternate days, and the 
changes in the development of the larvae recorded. In order to observe 
exactly when moults occurred, and to measure the corresponding length 
of the larval instar the shoots were split slightly or pared above the 
site of the gallery. After the necessary observations had been com¬ 
pleted, the split portion of the shoot was repaired with tape. This 
procedure undoubtedly disturbed the larva while the observations 
were being made, but they were carried out rapidly, as a glance at the 
body color and the size of the head was sufficient to determine if a 
change had occurred or was imminent. The length of the life-cycle 
was not appreciably affected, as under natural conditions the larva 
often leaves the interior of a shoot in which it is feeding, to eat the 
external layers or to bore in at a new spot. 
When the larvae had pupated, the shoots were cut off and trans¬ 
ferred to rearing cages, in order to record the emergence of the moth. 
2. An experiment on parallel lines was carried out in glass rearing- 
cages containing moist earth, for the reception of inoculated shoots. 
When the necessity occurred, the larvae were transferred to fresh shoots. 
The result of the inoculation experiments are shown in tabular form 
on the next page. 
[ 191 ] 
