67 



Plate III 



Fig. 9. Longitudinal section through egg of Camponotus 2 days old. X 52. 

 Fig. 10. Transverse section through blastoderm near posterior end of germ band. 



Same age as the one represented by Fig. 9. X 78. 

 Fig. 11. Transverse section through same stage as that represented by Figs. 9 and 



10. Taken near anterior end of germ band. X 78. 

 Fig. 12. Longitudinal section through blastoderm of Camponotus at a somewhat 



later stage than that represented by Fig. 9. X 52. 



Plate IV 



Fig. 13. Transverse section through anterior end of blastoderm of Camponotus. 



Same age as that represented by Fig. 12. X 78. 

 Fig. 14. Transverse section through middle of blastoderm. Same age as that 



represented by Fig. 12. X 78. 

 Fig. 15. Longitudinal section through blastoderm of Camponotus 5 days old. 



X 52. 

 Fig. 16. Longitudinal section through blastoderm of Camponotus 6 days old. 



X.78._ 

 Fig. 17. Longitudinal section through blastoderm of Camponotus 8 days old. 



X 52. 



Plate V 



Fig. 18. Transverse section through blastoderm of Camponotus 8 days old. 



X 105. 

 Fig. 19. Transverse section through embryo of Camponotus 14 days old. X 105. 

 Fig. 20. Transverse section through embryo of Camponotus 15-20 days old. 



X 105. 

 Fig. 21. Embryo of Camponotus 8-12 days old. X 52. 

 Fig. 22. Embryo of Camponotus showing development of appendages. X 52. 



Plate VI 



Fig. 23. Ventral view of germ band of the same age as that represented by Fig. 

 22. The yolk mass has lieen removed and the embryo, which is nor- 

 mally curved over the yolk, has been straightened out. X 52. 



Fig. 24. Embryo of Camponotus. A later stage than that represented by Fig. 23. 

 X 52. 



Fig. 25. Embryo of Camponotus at a stage just before hatching. X 31. 



Fig. 26. Embryo of Myrmica. Early stage. X 91- 



Plate VII 



Fig. 27. Embrvo of Myrmica, at a stage somewhat later than that represented by 

 Fig. 26. X 114 



Fig. 28. Ventral view of anterior end of germ band of same age as that repre- 

 sented by Fig. 27. X 91. 



Fig. 29. Side view of later stage of embrvo of Hfvnnica than that shown in Fig. 

 27. X.91. 



Fig. 30. Ventral view of same stage as the emliryo shown in Fig. 29. X 91- 



Fig. 31. A slightly different view of the same embryo. X 91. 



Plate VIII 



Fig. 32. A later stage of the embryo of Myrmica. X 91. 



Fig. 33. A still later stage of the embryo of Myrmica. X 91. 



Fig. 34. Ventro-frontal view of same emliryo as in Fie. 33. X 91- 



Fig. 35. Embryo of Myrmica at a stage when it is straightening. X 80. 



Fig. 36. Embryo of Myrmica just before hatching. X 91. 



