254 



IKJUKIOCS INSECTS 



with age. From the time it is one-third grown, the 

 httle dusky wing-pads may be discovered, though less 

 conspicnons than in the pupa state, which is soon after 



Fig. 155. — GRAPE PHYLLOXERA, KOOT-INHABJTINO TYPE. 



a, Shows a healthy root; b, one on which the lice are workinR. represt'ntlnff the 

 knots and ewellingB caused by their punctures ; c, a Root that has heen rie- 

 Bcrted by them, and where the rootlets have commenced to decay ; 

 d, d, a, show how tlie lice are found on the larger roots ; e, fe- 

 male pupa, dursi^l view ; /, same, ventrnl view ; (j, winged 

 female, dorsal view; /), same, ventral view. 



assumed. The pupre (fig. 155, e, f), are still more active, 

 and, after feeding a short time, they make their way to 

 the light of day, crawl over the ground and over the 

 Tines, and finally shed their last skin and assume the 



