128 THE BUTTERFLY VIVARIUM. 



so exactly like the living insect which has just 

 quitted it, that when seen at a little distance it is 

 often mistaken for it by anglers seeking the fly for 

 a bait, until they are close upon it, and just about 

 to seize their fancied prize. Those who would wish 

 to hear more concerning this rapid growth of the 

 wings of insects on their escape from the chrysalis, 

 may consult, on this interesting subject, the works 

 of Carus, Herold, and Chabrier, where they will 

 find many curious details very fully and graphically 

 described. 



"With the exception of the wings, insects may 

 be said not to grow at all after they have passed 

 from the pupa state, and assumed their final form. 

 The bodies of some of the Syrplms tribe, however, 

 expand, as it were, in a very curious manner, after 

 they come from the shell, becoming rapidly twice 

 the size which they seemed at first. This ap- 

 parently sudden growth was first noticed by 

 Gcedart, and is explained by Reaumur in the fol- 

 lowing manner : — The pupa case of this class of in- 

 sects, and of common flies, is, as it is well known, 

 remarkably small in proportion to the dimensions of 

 the perfect insect. Within this very small apart- 

 ment, the abdomen, by means of its annular struc- 

 ture, is compressed to two-thirds of its size ; but 



