p. K. Aw ATI 



•251 



The following tabl<' shows the period taken by each stage for its 

 moult. 



1st iiistar (Fig. 4). On twigs in the sand. 



On plants out.side. 



1. 23. 4.— 30. 4. 



2. 21. 4.-28. 4. 



3. 25. 4.— ql. f). 



2nd instar (Fig. 5). 



1. 18. 4.-25. 4. .. 



2. 20. 4.-27. 4. . . 



3. 26. 4.— 3. 5. . . 



3rd instar (Fig. 6). 



1. 

 2. 

 3. 

 4. 

 5. 

 6. 

 7. 

 8. 

 9. 

 10. 



29. 4.-6. 5. 

 28. 4.-4. 5. 



25. 4.-1. 5. 



26. 4.-3. 5. 



30. 4.-7. 5. 



25. 4.— 1. 5. 

 24. 4.— 1. 5. 



26. 4.-3. 5. 



27. 4.-3. 5. 

 26. 4.-3. 5. 



4th instar (Fig. 7). 



1. 

 2. 

 3. 

 4. 

 5. 

 6. 

 7. 

 8. 

 9. 

 10. 



1. 5.-11. 5. 



30. 4.— 10. 5. 



1. 5.— 11. 5. 



3. 5.— 12. 5. 



29. 4.-13. 5. 



30. 4.— 10. 5. 

 6. 5.— 15. 5. 

 3. 5.-12. 5. 



30. 4.— 10. 5. 

 6. 5.— 15. 5. 



8 days^ 

 8 days 

 7 days 



8 days 

 8 days 

 8 days/ 



8 days 

 7 days 



7 days 



8 days 

 8 days 



7 days 



8 days 

 8 days 



7 days 



8 days 



12 days 



11 days 



12 days 



10 days 

 15 days 



11 days 

 10 days 



10 days 



11 days 

 10 days 



5th instar or "Nymph" (Fig. 8). 



9. 5.— 21. 5. 



11. 5.-23. 5. 

 10. 5.-23. 5. 

 10. 5.-23. 5. 



12. 5.-24. 5. 



13. 5.-24. 5. 

 8. 5.— 20. 5. 



13 days 



13 days 



14 days 

 14 days 

 13 days 



12 days 



13 days 



'I'hore was no time for checking the period 

 of these instars. 



1. 9. 5.-18. 5 10 days. 



2. 12. 5.-22. 5 10 days. 



3. 13. 5.-22. 5 10 days. 



4. 13. 5.-22. 5 10 days. 



At this time the plants were trans- 

 ferred to the frames, where the heat 

 was greater than outside. The 

 variation in the time may be due 

 to this fact. 



6th or adult stage (Fig. 9). 



June to November, 



