Chionaspis. 151 



thoracic parts. There also appears to be some correlation between the 

 excessive deposition of chitin and the absence of circumgenital glands, e.g.^ 

 Aspidiotus aurantii, Chionaspis citri, Ch. permutans, Ch. flava, Ch. biclavisj 

 probably others could be added to the list. 



EXPLANATION OF PLATE LIIL 



Chionaspis flava. 

 {All figures^ except No. i, more or less enlarged.) 



Fig. I. Leai o{ Anlidesma, with insects in situ, nat. size. 



2. Female puparium, old scale. 



3. Male puparium. 



4. Adult female, after gestation. 



5. „ „ before gestation. 



6. Female puparium, early adult scale. 



7. „ „ from below. 



8. Adult female, ventral view. 



g. „ „ pygidium, dorsal view. 



10, „ „ antenna. 



