362 NEW YORK STATE MUSEUM 



PLATE 3 



Pernicious or San Jose scale insect 



Aspidiotus perniciosus Comstock 



FIG. 



1 Recently established scale in white stage on green twig, very much 



enlarged. (Note red coloring around it) 



2 Recently established young on green twig natural size. (Note red 



coloring around scales) 



3 Pear showing young scales and the red discoloration, natural size. 



(Same is shown on the leaf) 



4 Young scales in white stage on twig, natural size 



5 Mass of old scales, some young black ones and some in white stage 



on a twig, natural size 



6 Group of yellowish adult scales, enlarged 



7 Group of -dark adult scales surrounded by many young black ones, 



enlarged 



8 Adult male scale, very much enlarged 



9 Adult female scale, very much enlarged 



10 Adult female, very much enlarged 



11 Active young, very much enlarged 



12 Perfect male, very much enlarged 



13 Young in black stage, very much enlarged 



PLATE 4 



European fruit scale insect 



Aspidiotus osfreaeformis Curtis 



FIG. 



1 Recently established young, greatly enlarged 



2 Young in white stage, natural size 



3 Portion of above, much enlarged 



4 Half grown scales, much enlarged 



5 Half grown scales, somewhat enlarged 



6 Piece of badly infested bark, natural size 



7 Portion of twig showing mass of scales, much enlarged 



8 Male scale, very much enlarged 



9 Female scale, very much enlarged 



10 Female as removed from under a scale, very much enlarged 



1 1 Active young, very much enlarged 



