400 
Parasitic and Predaceous Enemies of Sphezrotrypes siwalikensis 
and S. coimbatorensis. 
ICHNEUMON SP. 
Plate XXIII, fig. 3. 
Classification:—Order, HYMENOPTERA. Family, Ichneumonide. 
Parasitic upon Spherotrypes siwalikensis. (The Sal 
Barkborer). 
Description, 
Pupa.—Small slender, white, resembling to some extent the 
mature fly but with the antenne, legs and wings closely pressed 
against the body, 
Imago.—The fly is small, blackish in colour, with 2 pairs of 
membranous wings. The antenne and legs are long and 
slender. The insect is shown in Plate XXIII, fig. 3. 
Life-History. 
This insect is parasitic upon the sal Spherotrypes, and the 
dates of its autumn generation appear to coincide with those of 
its host, pupz being found at the beginning of October and the 
imago emerging later on in themonth. Itis probable that this 
imago lays its eggs in or near the galleries containing the over 
wintering larve and that the ichneumon larva lives upon them, 
spending the winter as a grub, Or the winter may be passed 
through in the egg stage, 
Locality, Relations to Forest, etc, 
The insect was found in the Dun Sal areas of North-West 
India. 
It is likely to prove, if at all abundant, a most useful insect 
in the forest, since it helps to keep down the numbers of the 
Scolytid. 
The number of generations in the year and how and where 
each is passed through require further observation Do they 
coincide with those of its Scolytid host ? 
