Explanation of Plate II. 



The San Jose Scale, Aspidiotus perniciosus Comst. 

 I. Adult male. 

 II. Head of the same. 



III. Thorax of the same. 



IV. Leg of the same. 



V. Some segments of male antenna. 

 VI. Antenna of newly hatched larva. 

 VII. Caudal end of newly hatched larva. 



VIII. a — g. Caudal ends of last abdominal segment of female, showing 

 the variations in the plates etc. 



