55 



PLATE IV. 



Fig. 10. Last four segments of mature larva, a pericardial cell, b strand of fatty 

 tissue, c aorta, d bifurcator, c fat-sac, / anterior chamber of heart, g longi- 

 tudinal trachea, h alary muscles, i posterior chamber of heart, j posterior 

 valve of heart, k rudimentary sexual organ, / prominence bearing anal 

 seize (setas not drawn), in anal bristle, n trachea! gill. 



PLATE V. 



Fig. ii. Antenna: segments numbered, a bulb. 

 Fig. 12. Side view of bulb. 

 Fig. 13. End view of bulb. 

 Fig. 14. Antenna of larva No. 18. a bulb. 

 Fig. 15. Antenna of larva No. 4. a bow-net. 

 Fig. 16. Mentum. 

 Fig. 17. Striated flap. 



Fig. 1 8. Ventral view of one epicranial plate of larva No. 7. a striated flap, b vib- 

 rissae, c anterior bay, d posterior bay. 



Fig. 19. Hind segments of larva No. 9. a ventral blood-gill on segment 10, b anal 

 seta. 



PLATE VI 



Fig. 20. Longitudinal sections of a cardiac chamber, b cesophageal valve, c peri- 

 trophic membrane and d oesophagus. 



Fig. 21. Fat-sac. 



Fig. 22. -Fat-sac of larva No. 18. 



Fig. 23. One half of fat-sac of larva No. 12. a fat drop, b inner transparent mem- 

 brane, c outer pigmented membrane. 



Fig. 24. Pupa, No. 15, anal plates with hooks. 



Fig. 25. Ventral view of last segment of male pupa showing imaginal genital 

 armature (anal fringe omitted). 



Fig. 26. -Pupa No. i, respiratory cone. 

 Fig. 27. Pupa No. 5, respiratory cone. 



