Tech. Series 20, Pait I, Bureau of Entomology, U. S. Dept, of Agriculture, 



Plate XIV. 



Work of Pissodes strobi, Showing Character of Injury, Chip Cocoons, and Pupal 



Cells. 



a, Vigorous terminal slioot, sliowiug condition of new growth at time pupse are transforming to adults; 6, 

 3-year-old top, showing how larv;p have migrated from teriiunal to the 2 and 3 year old internodes; c, 

 cliip cocoon and pupal cell, natural size; d, work in 2 ami 3 year terminals, showing abnormal habit in 

 the laller. (rt-c. Author's illustrations; d, original. 1 



