

EXPLANATION OF PLATE IV. 



Pig. 1. ScuteUista cyanea, Motsch. Female: enlarged. 

 la. ScuteUista cyanea. Natural size. 

 lb. ScuteUista cyanea. Larva; natural size. 



2. ScuteUista cyanea. Male; enlarged. 



3. Rhizobius ventralis, Blackburn. Black ladybird ; enlarged. 

 3a. Rhizobius ventralis. Natural size. 



36. RJvizobius ventralis. Larva; enlarged. 



4. "'Black Scale" (Saisseta [Lecanium] oleae, Bern). On orange 



twig. 



5. "Black Smut"; fungus, existing on exudation of black scale. 



6. "Black Scale," showing exit holes of ScuteUista cyanea. 



