MAY. 165 



common towards the end of this and the begin- 

 ning of the next month ; the larvae live in the 

 solid wood of the oak, the ash, and the willow, 

 but more particularly the last, which they per- 

 forate in various directions. They are very de- 

 structive, as may easily be imagined from their 

 duration and size, the length of the full-grown 

 larvae being four inches, and their period of 

 existence in that state three years. They re- 

 main in the state of pupa or chrysalis about 

 three weeks. 



