BUFF-TIP. 243 



the bark. In this refuge it forms a cocoon made of 

 small chips of the bark fastened together with silk, 

 and of wonderful strength. The cocoon, indeed, is 

 mostly constructed of silk, the bark chips merely being 

 added to it in order to make it agree in appearance 

 with the trunk of the tree. Moisture does not soften 

 this silken secretion, though air hardens it, and the 

 consequence is that after exposure to the atmosphere, 

 the cocoon becomes as hard as if made of horn, so 

 that the inmate is safe from nearly all enemies ; while 

 the exact similitude between the surface of the cocoon 

 and the bark of the tree renders it almost incapable ot 

 discovery. 



The caterpillar is full-fed about midsummer, and, 

 passing the winter in its chrysalis state, is developed 

 into the Moth in the following June. 



THE very common and really handsome Moth, 

 the BUFF-TIP {Pygcera bucephald) is drawn in the ac- 



Pygaera bucephala. 



companying woodcut. The figure represents a male 

 with its wings spread. 



The upper wings of this Moth are beautifully 



R 2 



