424 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE XLVII 



Fig. 1. The San Jose Scale (Aspidiotus perniciosus) . Adult female scales 

 enlarged. 



Fig. 2. The Putnam Scale (Aspidiotus ancylus). Young and adult scales 

 enlarged. 



Fig. 3. The English Walnut Scale (Aspidiotus juglans-regiae). Young 

 and adult scales enlarged. Note the clustering habit of this species. 



Fig. 4. The Obscure Scale (Chrysomphalus obscurus.) Young and adult 

 scales enlarged. Note the shiny black nipples of the three scales in the center 

 of the photograph. This glossiness is not apparent until the scales are rubbed 

 and is then quite characteristic of the species. 



