Explanation of Plate "V. 



Fig. 1, the San Jose scale, Aspidiotus perniciosus Comstock, infesting a pear 

 twig; 2, the scales on a leaf; 3, scattered scales on a pear; J h a female 

 scale, enlarged; 5, a mole scale, enlarged. (From the Cornell Uni- 

 versity Agr. Exper. Station, and by permission of the ■ California 

 State Board of Horticulture.) 



