Plate V. 
Fic. 14. Segment of the trunk of larch with bark removed, 
showing the burrows of Polygraphus rufipennis and Phyma- 
todes dimidiatus. The wider grooves in the wood, many of 
which end in oval openings leading down into pupation 
chambers, are made by P. dimidiatus. About two-thirds 
natural size. 
