292 



PROTECTION AGAINST INSECTS. 



Fig. 146. Ootnu li</)/i/>t >{/, Fabr. 



a Imago (?). I Caterpillar, not fully grown. c Pupa. d Cocoon and 

 pupal exuviae (after emergence of the moth). 



same stem, sometimes 200 or more ; they attack not only 

 sickly trees, but thoroughly sound wood, and prefer solitary 

 trees in hedgerows, along forest borders, etc. They are very 

 voracious, and the wood which has been attacked is useless as 



