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The University Science Bulletin. 



PLATE XX. 



Development of Male Internal Genitall\: 



1. First instar. 



2. Second instar. 



3. Third instar. 



4. Fourth instar. 



5. Fifth instar. 



6. Fifth instar, phase 1, dorsal view. 



7. Fifth instar, phase 1, ventral view. 



8. Fifth instar, phase 2, dorsal view. 



9. Fifth instar, phase 2, ventral view. 



10. Fifth instar, phase 3, dorsal view. 



11. Fifth instar, phase 3, ventral view. 



12. Fifth instar, phase 3, lateral (right) view of oedagus. 



13. Fifth instar, phase 3, lateral (left) view of cedagus. 



14. Fifth instar, phase 4, ventral view of cedagus. 



15. Fifth instar, phase 4, lateral (right) view of oedagus. 



16. Fifth instar, phase 4, lateral (left) view of cedagus. 



17. Fifth instar, phase 4, lateral (right) view of oedagus. 



18. Fifth instar, phase 4, relative position of plates, styles and oedagus. 



