32 SPOLIA ZEYLANICA. 



enough to observe the actual emergence of this Ichneumonid grub 

 from the parasitized larva, and writes as follows : — 



" My jfirst attempt was interrupted by the sudden emergence of an 

 Ichneumon grub. Whilst endeavouring to draw this caterpillar a 

 lump appeared between the 7th and 8th somites, inside which 

 vigorous movements were seen. Presently a yellowish grub forced 

 its way through the skin at this point. The grub has a row of 

 rounded tubercles on each side, which it alternately protrudes and 

 retracts during its efforts to free itself from the body of the larva. 

 While its hinder extremity was still attached to the side of the 

 caterpillar, the grub commenced to spin its cocoon. Bulk for bulk, 

 the grub is little smaller than the larva from which it has emerged. 

 Within an hour the grub has completely enclosed itself in a pale 

 yellow silken cocoon. Meanwhile, the caterpillar had completely 

 collapsed." 



Roughly, about one- third of the larvae collected seem to be 

 attacked by this parasite, which emerges from its cocoon after 

 about eight days. 



I am indebted to Mr. E. Ernest Green for the drawings of figures 

 6 and 7. 



