MEDITERRANEAN FRUIT FLY IN HAWAII. 



55 



period. During June when the mean temperature was 77.6° F. two 

 larvae completed their entire development in 5.1 and 5.5 days, respect- 

 ively, but they were transferred daily 

 to fresh pieces of ripe papaya and thus 

 were surrounded by the best of condi- 

 tions. However, other larvae equally 

 well cared for and similarly fed and 

 transferred did not reach maturity 

 and pupate until 6.7, 12, and 14 days. 

 Ordinarily larvae complete their devel- 

 opment in from 6 to 10 days at an aver- 

 age mean temperature of 76° to 79° F. 

 During the cooler part of the year, 

 when the average mean temperature 

 is about 69.6° F., larvae transferred 

 daily to fresh ripe papaya did not be- 

 come fully grown until 9, 10, and 14 

 days old, while at about the same tem- 

 perature 18, 12, and 1 larvae required 

 10, 11, and 15 days for development 

 in a green half -grown peach. At a mean temperature of about 79° to 

 71° F., 12, 14, 3, 1, and 1 larvae pupated 14, 16, 19, 22, and 26 days, 

 respectively, after hatching. Larvae hatching during December 25 to 



Fig. 11. — Anterior spiracles of larva of the 

 Mediterranean fruit fly: a, Second-instar 

 larva; 6, third-instar larva. (Original.) 



Fig. 12. — Posterior spiracles of third-instar larva of the Mediterranean fuit fly. (Original.) 



26 in a very firm textured apple required 19, 25, and 35 days for 

 development when the mean temperature averaged about 68° F. 

 Four and 3 larvae became full grown in 6 and 7 days, respectively, in 

 a ripe soft peach at a mean temperature of from 77° to 78° F., whereas 



