150 



IXSECT ARCHITECTURE. 



section of these leaves has the appearance of filigree-work 

 (see b). 



:Sest of Willow-leaf Roller. 



A caterpiUar which feeds upon the willow, and whose 

 singular attitudes have obtained for it the trivial name of 

 Ziczac, also constructs for itself an arbour of the leaves, 

 by drawing them together in an ingenious manner. M. 

 Eoesel* has given a tolerable representation of this nest, 

 and of the caterpillar. The caterpillar is found in June ; 

 and the moth (Nofodonta ziczac) from May to July in the 

 following year (see cut, p. 151). 



Beside those caterpillars which live solitary in the folds 

 of a leaf, there are others which associate, employing their 

 united powers to draw the leaves of the plants they feed 

 upon into a covering for their common protection. Among 

 these we may mention the caterpillar of a small butterfly, 



* Roesel, cl. ii., Pap. Noctirrn., tab. xx. fig. 1, 2, 3, 4, 5, 6. 



