PLATE B. 



FIG. 1. SAN JOSE SCALE 

 (Aspidiotus perniciosus) on Peach branches (nat. size). 



FIG. 2. OYSTER-SHELL BARK LOUSE OR SCALE 



(Aspidiotus ostreseformis) on Plum branch (nat. size). The small branch to 

 the right is from a healthy tree, and is free from scale. 



J/llard ft" Son. Imt>. 



