27 



I have on several occasions seen trees that were once badly infested throw olf 

 the scale in some inexplicable manner and take, as it were, a new lease of life. This, 

 however, does not seem to happen very frequently. 



Fig. 14. Various stages of the Oyster-shell Scale: 4. The scale slightly enlarged 

 on a twig. The little holes in the scales indicate where parasites emerged. 

 1. The female scale very much enlarged, showing general shape. 5. A 

 similar scale turned over to show the eggs beneath. The shrivelled body 

 of the female herself is beyond the eggs at the small end. 2. A female 

 removed from beneath the scale before she has laid her eggs. Note the 

 bristle-like moulh parts similar to those of San Jos6 Scale in fig. 4. 3. A 

 male scale. 6. Young larva, dorsal view. 7. Winged male. All except 

 No. 4 much enlarged (after Sherman and Metcalfe). 



HOW TO IDENTIFY THE OYSTER-SHELL SCALE. 



Appearance.— Fig. 14 with the description beneath it makes the appearance 

 of the adult female scale (the only stage of the insect noticed by fruit-growers) so 

 clear that very little further description is necessary. The insect is about % of an 

 mch long and scarcely 1-3 of this in width, is frequently curved more than shown 



