EXPLAi^ATION TO PLATE II. 



Fig. 3. — ^^Pemphigus popxjli-moniliS : a, winged female ; 6, her antenna ; c, her 

 antenna at birth ; d, same after first molt ; /, her tarsus ; e, her issue at birth, ventral 

 view — all enlarged ; g, leaf showing galls — nat, size. 



Fig. 4. — HoRMAPHis SPiNOStJS : a, gall — nat. size ; h, winged female (the left wings 

 showing abnormal venation) ; c, her tarsus ; d, her antenna ; Ji, frontal tubercle, as seen 

 at birth ; e, her issue at birth, ventral view ; /, granulated surface of same ; g, antenna 

 of same — all enlarged. 



Fig. 5. — Pemphigus POPUu-TRAifsVERSUS : a, gaU from side; i, same from be- 

 neath — nat. size ; c, winged female (wings on left side detached) ; d, her antenna — 

 enlarged. 



