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249 



device (Fig. 3). At the same time the larva is provided with an egg- 

 breaker on the front part of its head. This egg-breaker consists of some 

 stout spines attached to the flat part of its head. The spines push 

 the dovetailing device apart, and the larva crawls out. There are a 

 number of spines both dorsally and ventrally which keep the sides of 



Fig. 1. 



Fig. 2. 



Fig. 3. 



the egg apart, while the larva is creeping out. The following is a com- 

 plete diary of a larva hatching out : 



27. 3. 13. 



10.30 p.m. The larva began to come out. 



11.30 p.m. It was completely extruded from the egg but was still 



attached to it. 

 11.50 p.m. Sitting at the opening of the egg, moving its antennae 



and thus taking rest after a great deal of trouble. 

 2.30 a.m. Quite free from the egg and walking about. 

 The larva is completely yellow when it comes out and the egg-shell 

 is opaque white. Thus it seems that the change in colour of the egg 

 is due to the larva which becomes brown or reddish as its time for 

 hatching out is nearing. 



(e) Behaviour of the first larva. The larva, after resting a while, 

 begins to crawl up towards the apical bud of that twig. It has a pair 

 of well-developed antennae, the last segment of which is drawn out and 



