182 Schrader. The sex ratio and oogenesis of Pseudococcus citri. 
Fig 
. 18. Chromosomes of two giant cells in close apposition, showing origin of multiple 
number of chromosomes. 
Fig. 19. Normal blastoderm cells near three giant cells. 
Fig. 20. Normal blastoderm cells displacing giant cells at periphery. 
Plate 4. 
Fig. 21. Giant cells in initial stage of migration to anterior pole. 
Fig. 22. First giant cells entering between symbionts. 
Fig. 23. Later stage of association of giant cells with symbionts. 
Fig. 24. Association between giant cells and symbionts almost complete. 
Fig. 25. Spheres of symbionts in intimate association with giant cells in the embryo, 
shortly before hatching. 
Fig. 26. Symbiouts and a giant cell showing multiple number of chromosomes. From 
adult female of Pseudococcus. 
Plate 5. 
Fig. 27. Giant cells, yolk cells, blastoderm cells and symbionts in an egg at the 
blastoderm stage. y = yolk cell. 
Fig. 28. Giant cells just prior to migration. A few yolk cells going to periphery. 
Fig. 29. Germband with germ cells (g). Giant cells in contact with symbionts. 
Fig. 30. S shaped embryo, with germ cells near tip of germ band. Mid intestine 
cells (m). 
Fig. 31. Embryo with germ cells dissociated from tip of germ band. 
Fig. 32. Embryo soon after revolution, and prior to outgrowth of vaginal invagination. 
