DISCUSSION OF GENERA AND SPECIES 



53 



Fully mature female (Fig. 30) more or less circular in form, with the 

 derm very heavily chitinized except for the pygidium and one or two ab- 

 dominal segments anterior to the pygidium. The pygidium is retracted 

 into the ventral side of the abdomen. Specimens taken at this stage are 

 difficult to study morphologically owing to the heavy chitinization of the 

 derm. 



Fig. 30. Aspidiotus pint Comst. : ventral aspect of adult female from specimen from 

 pine, Ithaca, N. Y. 



Fig. 31. Aspidiotus pini Comst.: pygidium of specimen from pine, Ithaca, N. Y. 



