328 



THE AMERICAN MONTHLY 



[Oct. 



broad as the other lobes. Terminal lobes are rounded 

 at the apex and are distinctly notched near the middle of 

 the external edge. The second pair of lobes is smaller 

 and narrower and is also notched externally. Between 

 the first and second lobe on either side is a small spine 

 and two or three such spines are just back of the second 

 lobe, while back of these are three stout teeth, curving 

 anteriorly (fig. 8,d.) Astillsmaller blunt tooth sometimes 

 occurs near the middle uf the lateral margin. The segmen- 

 tation of the body at this stage is quite distinct. At each 



FIGURE 6. 



Aspitliotijs pernicious or San Jose Scale : Young larva and developing scale a, ventral view of 

 larva, showing suckiug beiik with seta; separated, with enlarged tarsal claw at right; b, dorsal 

 view of same, somewhat contracted, with the first waxy filaments appearing; c, dorsal and lat- 

 eral views of the same, still more contracted, illustrating still further development of wax secre- 

 tion ; d, later stage of the same, dorsal and lateral views of the same, showing matting of wax 

 secretions and first form of young scale— all greatly enlarged. 



molt the old skin splits around the edge of the body, the 

 upper half adhering to the covering scale and the lower 

 forming a sort of ventral scale next to the bark. This 

 form of molting is common to scales of this kind. 



At this stage the male scales are more yellowish than 

 the females. The effect of the sucking of the insects is 

 now quite apparent on the young growth, causing the 

 bark to assume a purplish hue for some distance around 



