18fi 



INSECT ARCHITECTURE. 



whole by adding a broad piece longei- than the rest 

 lo shade his door-way over-head, so that he may not 

 be seen from above. A more laborious structm-e is 

 reared by the grub of a beautiful caddis-fly (Phry- 

 ganea), which weaves together a group of the leaves 

 of aquatic plants into a roundish ball, and in the in- 

 terior of this forms a cell for its abode. The fol- 

 lowing figure from Roesel v.ill give a more precise 

 notion of this structure than a lengthened description. 



J 



Another of thp>v j.quatic- architects make clioice 

 of the tiny shells of young li-esh-water mussels and 

 snails (Planorhis), to form a moveable grotto, and 

 as these little shells are lor the most part inhabited, 

 he keeps the poor animals close prisoners, and drags 



Hhell Nests ofCaddis-Wo 



