124 



THE CANADIAN ENTOMOLOGIST. 



When on the roots the Hce subsist also by suction, and their punctures 

 result in abnormal swellings on the young rootlets, as shown at a in figure 



1 6. These eventually 

 decay, and this decay is 

 not confined to the 

 swollen portions, but in- 

 volves the adjacent tis- 

 sue, and thus the insects 

 are induced to betake 

 themselves to fi-esh por- 

 tions of the living roots, 

 until at last the larger 

 ones become involved, 

 and they too literally 

 waste away. 



In figure i6 we have the root-inhabiting type, Radicicola, illustrated ; 

 a, roots of Clinton vine, showing swellings ; /;, young louse as it appears 

 when hibernating; c, d, antenna and leg of same; e, f, g, represent the 

 more mature lice. It is also further illustrated in fig. 17, where a shows 

 a healthy root, d one on which the lice are working, c root which is decay- 

 ing and has been deserted by them ; d d d indicates how the lice are 

 found on the larger roots ; 

 e, female pupa seen from 

 above, / the same from 

 below ; g, winged female, 

 dorsal view ; h, the same, 

 ventral view ; /, the an- 

 tenna of the winged insect ; 

 y, wingless female laying 

 eggs on the roots, while k 

 indicates how the punctures 

 of the lice cause the larger 

 roots to rot. Most of these 

 figures are highly magni- 

 fied ; the short lines or Fig. 16. 

 dots at the side showing the natural size. 



During the first year of the insect's presence the outward manifestations 



