OPHION AUREOLATUS. 341 

Points in the iife-history requiring further observation. 
1, Where the ichneumon fly deposits her egg. Is it on 
the external surface of the caterpillar, or does 
she make a small incision in the skin and place it 
in this? 
2, The number of eggs laid upon any one caterpillar. 
T have never obtained more than one fly from 
any one pupa. 
3. The number of eggs laid by one ichneumon. 
4. The exact length of time spent by the ichneumon 
, grub feeding within the Acronycta. Does it 
pupate immediately after the Acronycta cater- 
pillar has done so? 
5e Exact period of issuing of the flies, 
