Bui. 48, Div. of Entomology, U. S. Dept of Agriculture. 



Plate XXI 



CL 



\ 



Dead Spruce; also Fir and Birch. 



, Old dead spruce and a dead birch in cutting; bl, remains of verv old dead spruce: b2, appear- 

 ance of spruce tree after it has been dead five to ten rears or more: c, white spruce, dead three 

 or four years; d, dead spruce, fir, and birch, killed by fire: e, dead spruce and fir on summit of 

 Rump Mountain. Maine. (From Bui. 28, n. s., Div. of Entomology. U. S. Dept. of Agriculture ) 



