400 



THE INVERTEBRATA 



the alimentary canal, are broken down by phagocytic or other action 

 and the new adult tissue is buih up from many growth centres. 



Fig. 299, Metamorphosis of a capsid bug (Plesiocaris vagicollis). After 

 Petherbridge and Hussain. 1-4, nymphal instars ; 5, imago. 



A less obvious prepupal instar is also present, enabling the change 

 from larva to pupa to be effected. 



