

Fig. 37.— Phylloxbba. a, healthy root ; b, infested root, showiQ? knots and Bwelllngs caused by the lice ; c. a root deserted, and rootlets 

 decaying;' (f (2, insects on larger roots; ef, upper and under surface of female pupa; g h, upper and under surface of winged female : 

 jt -wingless female laying eggs ; Jc, large root rotting through punctures of the lice. 



Fig. 38.-Pupa and imago oi Khort-hodied form of Phylloiera. 

 e. Imperfect eggs formed in the abdomen. 



Fig. 39.— Vine-leal infested with Phylloxera, forming small galto 

 on leaf. 



