22 



INSECT ARCHITECTURE. 



with gold, the Greeks called them Chrijsalides, and 

 the Romans Aurelice, and hence natiiraUsts frequently 

 call a pupa chrysalis^ even when it is not gilt. We 

 shall see, as we proceed, the curious contrivances re- 

 sorted to for protecting insects in this helpless state. 

 After a certain time, the insect which has re- 

 mained in its pupa-case, like a mass of jelly without 

 shape, is gradually preparing for its final change, 

 when it takes the form of a perfect insect. This 

 state was called by Linnaeus, Imago, because the 

 insect, having thrown off its mask, becomes a per- 

 fect image of its species. Of some, this last por- 

 tion of their existence is very short, others hve 



Insects in the Imago or perfect state. 



