374 



Journal of Agricultural Research 



\oi. Ill, No. 5 



Table VI. — Duration of the larval stage of the Mediterranean fruit fly 



Num- 

 ber of 

 speci- 

 mens 

 under 

 obser- 

 vation. 



Approximate period of 

 development . 



Host fruit. 



Instar 



Instar 



3- 



Larval 



stage. 



Mean 

 temper- 

 ature 

 for 

 period 

 of de- 

 velop- 

 ment. 



I 



2 



I 

 I 

 I 

 I 

 12 

 I 

 I 

 I 

 2 

 7 



6 



4 



3 



i8 



12 



3 

 I 

 I 



12 



'7 

 14 



20 



8 



3 

 3 



2 

 I 

 I 



June 12 to i8 



Do 



Do 



Do 



June 19 



Do. 

 June 19 



I to 25 . 



June 19 

 June 19 

 June 19 

 June 22 

 June 22 

 June 26 

 June 26 

 June 26 

 Mar. 31 

 Mar. 31 

 Mar. 31 

 Mar. 31 

 Mar. 31 

 Mar. 13 

 Mar. 13 

 Mar. 13 

 Mar. 13 

 Mar. 13 

 Mar. 13 

 Mar. 13 

 Mar. 13 

 Mar. 13 

 Mar. 13 



to 26 



to 27 



to July I . . 

 to July 3 . . 

 to July 2 . . 

 to July 3 . 

 to July 6. 

 to July 2 . 

 to July 3 

 to Apr. 10. 

 to Apr. 1 1 . 

 to Apr. 12. 

 to Apr. 13 . 

 to Apr. 15. 



to 27 



to 28 



to 29 



to 30 



to 31 



to Apr. I . . 

 to Apr. 2 . . 

 to Apr. 3 . . 

 to Apr. 4. . 

 to Apr. 8. . 



Papaya. 

 ...do.. 



...do 



...do 



...do 



...do 



....do 



...do 



...do 



...do 



Green peach 



...do 



Hard peach 



Ripe peach 



.. do 



Green peach 



... do 



...do 



.. .do 



...do 



California lennn. 

 do 



do. 



do. 



do. 

 .do. 



do. 



do. 

 .do. 



do. 



Mrs. 



38 

 36 

 36 

 48 



26 



48 

 48 

 48 

 48 

 48 



Hrs. 



36 



48 



48 



48 



30 



24 



24 



30 



24 



27-5 



Hrs. 

 48 

 48 

 48 

 48 

 72 



72 



96 



96 



216 



264 



Days, 



5- I 

 5-S 

 5-5 

 6.0 



5-3 

 6.0 

 7.0 

 7.2 

 12. o 



14+ 



10 



II 



9-5 

 6 



7 



10 

 II 

 12 

 13 

 IS 

 14 

 IS 



16 



17 

 18 



19 



20 

 21 

 22 

 26 



°F. 



77.6 



77.6 



77.6 



77.6 



76.4 



76.4 



76.6 



76.6 



77.0 



77.1 



77.2 



77.2 



77-4 

 77.8 



77-7 

 69.6 

 69.8 



70. o 



70-3 



71. o 



70. 2 



70-3 

 70-3 

 70.4 

 70. 4 

 70-5 

 70-5 

 70.4 

 70.4 

 70.4 



