524 



INSECT ARCHITECTURE. 



by the vapourer (Orgyia antiqua, Hubner), and 

 many others. 



These are additional instances of the remarks we 

 formerly made, that caterpillars which spin a slight 

 web are transformed into perfect insects in a much 

 shorter period than those which spin more substantial 

 ones. Thus the cream-spot tyger {Jlrctia villica, 

 Stephens) lies in the chrysalis only three weeks, and 

 therefore does not require a strong web. It is figured 

 below, along with another, which is still slighter, 

 though more ingeniously woven, being regularly 

 meshed like net-work. 



Cocoon of Arctia xillka. 



I^ct work cocoon. 



A very prettily netted cocoon is constructed by the 

 grub of a very small grey weevil {Hijpera Rinnicis), 

 which is not uncommon in July, on the seed spikes 

 of docks {Rumices). This cocoon is globular, and 

 not larger than a garden pea, though it appearss to 



