FISHERIES, GAME AND FORESTS. 



387 



the bark and come from eggs laid the same season. The nearly full grown borer 

 (Plate 3, figure 3) is about two inches long, white, with some rosy tints and in other 

 respects closely resembles the smaller ones. 



Life History and Habits. The parent insects or beetles occur from the latter part 

 of June till into August. Most of the eggs are probably laid during the latter two 

 months. The place of oviposition (Plate 3, figures 1, id) may be recognized by the 

 irregular discoloration of the bark, caused in part by the sap flowing from the wound 

 and partly from the expelled frass or excrement, the latter often hanging in small 



Figure 7.— Injury produced by a trans- 

 verse burrow in a sugar maple 

 about eighteen inches in diameter 

 (original). 



ifcl 



WMMmMMm 



Figure 8.— Large dead area produced by the 

 intersection of several burrows. Tree 

 about fifteen inches in diameter (origi- 

 nal). 



masses from the point of entrance. I have found burrows about thirty feet from the 

 ground, but most of them occur in the trunk or near the base of the larger limbs. The 

 latter seems to be a favorite place for the deposition of eggs. The young borer 

 passes the winter in a rather shallow excavation in the sap wood, the following spring 

 renewing operations with increased vigor. The boring of the second season is largely 

 just under the bark, the burrows being about one half an inch in width and one third 

 of an inch in depth, and running in almost any direction, though usually longitudinally 

 or obliquely upward and partly around the tree. Sometime during its life, probably 

 in the second fall when the borer is about sixteen months old, a deep burrow is made, 



