EXPLANATION OF PLATE IV. 



Fig. 1. Scutellista cyanea. Motsch. Female : enlarged, 

 la. Scutellista cyanea. Natural size. 

 Ib. Scutellista cyanea. Larva; natural size. 



2. Scutellista cyanea. Male; enlarged. 



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

 3a. Rhizobius ventralis. Natural size. 



3b. Rhizobius 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 Scutellista cyanea. 



