8 



W, across the middle another yellow band arching backwards, 

 and on the yellow tip a black, curved band and spot ; the legs 

 are yellow ; and the under side of the body is reddish-yellow, 

 variegated with brown." 



These beetles come forth from their burrows in the tree dur- 

 ing July and August. During the latter month they lay eggs 

 in the bark of sugar maples, selecting almost any part of the 

 trunk for this purpose. In a short time — perhaps a week — 

 these eggs hatch into small larvae or grubs that burrow oblique- 

 ly upward through the bark ; their progress is slow, and more 



t 



Fig. 4. Mines of young Maple Borers. (After Packard). 



or less " frass " or castings are thrown out of the outer hole as 

 they proceed. On this account the location of the little borers 

 can generally be determined by looking the trees over carefully. 

 The larvae do not get beyond the bark the first autumn, and 

 remain in their shallow burrows until the following spring. 

 Then they burrow deeper into the solid wood of the 

 tree, which thereafter they mine in all directions, the bur- 

 rows growing larger as the insect increases in size. Finally 



