The Horn-Tails 



the lower end of the burrow for half an inch with frass. They 

 then eat a passage through the side of the twig about a quarter 

 of an inch above the prospective cocoon, but without cutting 

 through the bark. Then the cocoon is spun in the burrow and 

 the larva remains within it all through the winter, changing to 

 pupa early in the spring. 



In young willow groves, the shoots of which are intended 

 for basket-making, the withered tips should be pruned off as soon 

 as noticed in the spring. 



72 



