MEDITERRANEAN FRUIT ELY 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 larvae of the 



Mediterranean fruit fly . 



Number 



Host fruit. 



Number 

 of fruits 



Dead larvae. 



Living larvae. 



hours im- 















mersed. 





ined. 



First 



Second 



Third 



First 



Second 



Third 







instar. 



instar. 



instar. 



instar. 



instar. 



instar. 



23 



] 



f 4 



4 







64 







106 



18 



41 



i Apple 



2 

 1 6 



104 

 



81 

 91 





 32 





 



4 

 







72 









94 



J 



8 







262 



107 















4 





21 



















63 



279 



22 





22 











5 







113 



448 



49 





23 











88 











51 



72 



["Winged kamani 



33 











179 











12 



96 





253 











1.376 











1 



98 





21 











142 















120 



] 



34 











147 















4 



1 



4 



36 



80 



















24 





5 







9 











8 



17 



70 





50 



1 













 12 



217 

 









72 

















98 



J 



3 







37 



















IS 



[Chinese orange 



94 



39 



34 



162 



50 



33 



9 



4 



4 



7 



35 



\ 54 





 

 



123 

 71 

 



189 

 163 



191 

 205 

 98 

 22 

 9 

 45 

 65 

 61 

 14 

 37 





72 



97 



45 





3 



69 









72 









94 







57 









116 J 











18 1 





63 





51 



168 



46 l~ 







3 



69 

 94 



fuuava 





19 



















49 || 











11 



72 f Strawberry guava. . . 

 96 J 





17 









107 







38 





17 

 40 







28 







36 



74 \ 



I 1 



/ 58 

 \ 50 





9 

 14 

 9 



5 



87 



32 



156 



422 









96 

 121 























66 1 









2 



91 



f reacn 

























81340°— 18— Bull. 53( 



