PLATE XVIL 



BELOSTOMA. 



Fig. 1. First instar B. fluminea. 



Fig. 2. Second instar, B. fluminea. 



Fig. 3. Third instar, B. fluminea. 



Fig. 4. Fourth instar, B. fl^iminea. 



Fig. 5. Egg of B. fluminea. 



Fig. 6. Egg hatching. Note the red eye spots appearing. The thin 

 margins of the nymph are rolled ventrally. 

 Fig. 7. Fifth instar B. fluminea. 



Fig. 8. Front tarsus of first instar of B. fluminea. Note the size 

 of the claws. Compare with figure 9. 



Fig. 9. Front tarsus of second instar of B. fluminea. The second 

 claw diminishes in size till in the adult it is not present. 



Fig. 10. Antenna of first instar nymph B. fluminea. 



Fig. 11. Antenna of fifth instar nymph B. fluminea. 



Fig. 12. Ventral view of abdomen of female B. fliiminea. 



Fig. 13. Egg of Lethocerus Uhleri laid in laboratory. 



Fig. 14. Ventral view of abdomen of male B. fluminea. 



Fig. 15. Ventral abdominal view of Benacus griseus, female. 



Fig. 16. Single eggs of Benacus. 



Fig. 17. Ventral abdominal view of Benacus griseiis, male. 



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