14 LIST OF ILLUSTRATIONS. 



Work of Coarse Writing Bark Beetle in White Pine, - - - 

 Pupa of Dendroctonus terebrans, ------- 



tomicus calligraphus, ---------- 



Declivity of Tomicus calligraphus, - 



White Pine Killed by Bark Borers in 1900, Lansingburgh, N. Y., - 

 Hard Pine Deformed by Work of White Pine Weevil, Salem, N. Y., 

 Work of Coarse Writing Bark Beetle in White Pine (two plates), 

 Declivity of Tomicus cacographus, ------- 



Work of Pine Bark Borers, -------- 



Declivity of Tomicus pini, - - - - 



Work of Bark Borers in White Pine (two plates), - - - - 



Declivity of Tomicus caelatus, -------- 



Borers and Insect Galls, --------- 



Work of Pitvophthorus Species in White Pine, - - - . . 

 Rhagium and Pytho, ---------- 



XyLOTERUS BIVITTATUS, ---------- 



Gnathotrichus materiarius, --- 



Gallery of Gnathorichus materiarius in Pine, - - . - . 

 Insects Affecting Hard Pine, -------- 



Insects Affecting White Pine, -------- 



Polygraphus rufipennis, -.---..-. 

 Spruce Bark Rather Badly Eaten by Polygraphus rufipennis, 

 Spruce Bark Badly Eaten by Polygraphus rufipennis, - - - 



Xyloterus POLITUS, ----------- 



MoNARTHRUM MALI, - - - - - -'- 



Galleries of Monarthrum mali in Maple, ------ 



Ambrosia of Monarthrum mali. Greatly Enlarged, 



Declivity of Tomicus balsameus, 



Central Chamber and Egg Galleries of Tomicus balsameus, 

 Galleries oe Tomicus balsameus, -------- 



Work of Balsam Bark Borer in Balsam, - - . - . 



Galleries of Tomicus balsameus, 



Split Twig, - 



Operations of Large Black Carpenter Ant, - . . . . 

 Phl^osinus dentatus — Adult Gallery and Egg Notches, - 

 Phl^eosinus dentatus — Small Gallery and Larval Mines, 



Insects Affecting Oak, - - 



The End of the Day, 



