JOUENAIi OF ENTOMOLOGY AND ZOOLOGY 47 



two or three hours after hatching. The larvse do not seem to 

 migrate very far. They wander around five or six hours before 

 they begin feeding. Plate I, Fig. 6 shows the wanderings of an 

 active larva on a sheet of paper. The larvae of the fourth gener- 

 ation are comparatively active and migrate quite a distance on the 

 infested shoot, usually going toward the tip. The following table 

 shows distances between the mother of this generation and the 

 place where the young settled (used sixteen selected canes of rasp- 

 berries and always took the highest measurement from each cane; 

 allowed but one female on each shoot) : 



No. 1 20y2 Inches No. 9 14^ inches 



No. 2 23y2 " No. 10 21 



No. 3 12 " No. 11 26 



No. 4 16^ " No. 12 21^ " 



No. 5 9 " No. 13 23^ " 



No. 6 19^ " No. 14 23 



No. 7 13^4 " No. 15 26H " 



No. 8 18^ " No. 16 18^ " 



The larva of the first, second and third generations usually set- 

 tle toward the base of the canes. The active larva commences to 

 take its first meal just as soon as It settles down, pushing the long 

 needle-like mouth parts Into the tissue of the plant. The antennas 

 and legs then rest perfectly flat on the bark. In several days, the 

 body of the young gradually turns from pale orange to dark brown 

 color. Now a soft cottony secretion can be seen from the posterior 

 margin of the young. Just underneath it, a waxy substance is 

 formed a few days later and It grows continuously until the size 

 increases to two or three times the size of the body. The waxy 

 substance finally becomes firm and scaly at this time. Scale of 

 the female can be readily distinguished from that of the male about 

 this time by its ovate shape (PI. I, Fig. 15). 



5. Second Stage of the Female Larva 



After the first moult, the body grows rapidly and the pygidium 



takes the prominent shape with distinct groups of spinnerets and 



even the marked marginal plates. The insect In this stage is 



broad in the middle and more or less trapezoidal in front without 



