MEDITERRANEAN FRUIT FLY IN HAWAII. 



113 



that they were distended and apparently dead when removed from 

 the water. A small percentage of other larvae taken from the water 

 after 3 days showed traces of life, but no adults developed from the 

 fruit submerged for 4 days. 



With the temperature ranging between 67° and 80° F. the writers 

 were able to demonstrate that well-grown larvae placed in tightly 

 stoppered vials of fresh water died by the end of the third day. Thus 

 486 of 490 larvae survived submergence 21 hours, 96 of 100 for 24 

 hours, and 78 of 100 for 48 hours; two lots of 100 larvae each sub- 

 merged 70 and 74 hours, respectively, were dead. It was found, 

 however, that larvae live longer when placed in water in open vials. 

 Under such conditions certain individuals may remain suspended 

 from the surface film of water much as do mosquito larvae and 

 pupae. This is made possible by the circlet of small hairs about the 

 posterior stigmal plates. While larvae ordinarily become rigid and 

 apparently dead within 2 or 3 hours after submergence in water, 

 larvae thus suspended were found to remain active for as long as 7 

 days in one instance. One larva removed to fresh fruit after sus- 

 pension for 5 days pupated 7 days later and emerged as an adult after 

 9 days in the pupa stage. 



Table XXXI. — Effect of submergence of host fruits in water upon the larvse, of the 



Mediterranean fruit fly. 



Number 

 hours im- 

 mersed. 



Host fruit. 



Number 

 of fruits 

 exam- 

 ined. 



Dead larvse. 



Living larvse. 



First 

 instar. 



Second 

 instar. 



Third 



instar. 



First 

 instar. 



Second 

 instar. 



Third 



instar. 



23 

 41 

 72 

 94 

 4 

 22 

 49 

 72 

 96 

 98 



120 

 4 

 24 

 70 

 72 

 98 

 18 

 45 

 69 

 72 

 94 



116 

 IS 

 46 

 69 

 94 

 49 

 72 

 96 





1 ! 



21 



> 22 



i 23 



33 



253 



21 



34 



4 



5 



50 



1 



3 



94 



39 



34 



162 



50 



33 



9 



4 



4 



7 



35 



54 



107 



5 



I | 



/ 58 

 \ 50 



4 

 104 

 

 

 

 

 

 

 

 

 

 36 

 

 

 

 

 

 

 







81 



91 



262 































80 



9 







12 



37 



123 



71 







64 







32 



107 







5 



88 



179 



1,376 



142 



147 











217 











189 



163 



191 



205 



98 



22 



9 



45 



65 



61 



14 



37 



38 





 

 

 

 

 

 

 

 

 

 

 

 



106 

 4 

 

 

 63 



113 

 

 

 

 

 

 

 8 



18 

 



] 



[Rose apple 











279 



448 



51 



12 



1 















17 



Chinese orange 





 





 



72 











97 





3 

















57 



















63 





51 



168 







3 



■Strawberry guava.. . 





19 

























11 





17 













17 

 40 





4 



M. elengi 



28 







36 



74 



> Orange 



9 

 14 

 9 



5 



87 



32 



156 



422 







96 











121 



J 











i 66 









2 



91 



























I 



81340°— 18— Bull. 53( 



